Fix xfs.py module that can no longer parse output from mkfs.xfs.

[snichol123]

What does this PR do?

When calling the function 'mkfs' from the xfs.py execution module on rhel 8 this is failing with the following stack trace being returned:

2021-09-08 05:06:19,245 [salt.loaded.int.module.cmdmod:409 ][INFO    ][89296] Executing command 'mkfs.xfs' in directory '/root'
2021-09-08 05:06:21,176 [salt.log.setup   :900 ][ERROR   ][89296] An un-handled exception was caught by salt's global exception handler:
IndexError: tuple index out of range
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 8, in <module>
    sys.exit(salt_call())
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/scripts.py", line 431, in salt_call
    client.run()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/call.py", line 57, in run
    caller.run()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/caller.py", line 136, in run
    ret = self.call()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/caller.py", line 222, in call
    ret["return"] = func(*args, **kwargs)
  File "<boltons.funcutils.FunctionBuilder-4>", line 2, in mkfs
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/utils/decorators/acl.py", line 64, in wrapper
    return f(*args, **kwargs)
  File "/opt/salt/3.7.3/lib/python3.7/site-packages/salt/modules/xfs.py", line 492, in mkfs
    return _parse_xfs_info(out["stdout"])
  File "/opt/salt/3.7.3/lib/python3.7/site-packages/salt/modules/xfs.py", line 107, in _parse_xfs_info
    ret[entry[0]] = {"section": entry[(entry[1] != "***" and 1 or 0)]}
IndexError: tuple index out of range

The above stack trace is raised due to the mkfs.xfs command now returning an additional string (Discarding blocks...Done.) which causes the parsing done in _parse_xfs_info to fail

meta-data=/dev/vg00/altvar       isize=512    agcount=4, agsize=1310720 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=5242880, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
Discarding blocks...Done.

What issues does this PR fix or reference?

Fixes:

Fixes the issue I have described above.

Previous Behavior

2021-09-08 05:06:19,245 [salt.loaded.int.module.cmdmod:409 ][INFO    ][89296] Executing command 'mkfs.xfs' in directory '/root'
2021-09-08 05:06:21,176 [salt.log.setup   :900 ][ERROR   ][89296] An un-handled exception was caught by salt's global exception handler:
IndexError: tuple index out of range
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 8, in <module>
    sys.exit(salt_call())
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/scripts.py", line 431, in salt_call
    client.run()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/call.py", line 57, in run
    caller.run()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/caller.py", line 136, in run
    ret = self.call()
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/cli/caller.py", line 222, in call
    ret["return"] = func(*args, **kwargs)
  File "<boltons.funcutils.FunctionBuilder-4>", line 2, in mkfs
  File "/opt/salt/3.7.3/lib64/python3.7/site-packages/salt/utils/decorators/acl.py", line 64, in wrapper
    return f(*args, **kwargs)
  File "/opt/salt/3.7.3/lib/python3.7/site-packages/salt/modules/xfs.py", line 492, in mkfs
    return _parse_xfs_info(out["stdout"])
  File "/opt/salt/3.7.3/lib/python3.7/site-packages/salt/modules/xfs.py", line 107, in _parse_xfs_info
    ret[entry[0]] = {"section": entry[(entry[1] != "***" and 1 or 0)]}
IndexError: tuple index out of range

New Behavior

/root # salt-call xfs.mkfs device=/dev/vg00/testvol
local:
    ----------
    data:
        ----------
        blocks:
            5242880
        bsize:
            4096
        imaxpct:
            25
        section:
            data
        sunit:
            0
        swidth:
            0 blks
    log:
        ----------
        blocks:
            2560
        bsize:
            4096
        lazy-count:
            1
        section:
            internal log
        sectsz:
            4096
        sunit:
            1 blks
        version:
            2
    meta-data:
        ----------
        agcount:
            4
        agsize:
            1310720 blks
        attr:
            2
        crc:
            1
        finobt:
            1
        isize:
            512
        projid32bit:
            1
        reflink:
            1
        rmapbt:
            0
        section:
            /dev/vg00/testvol
        sectsz:
            4096
        sparse:
            1
    naming:
        ----------
        ascii-ci:
            0
        bsize:
            4096
        ftype:
            1
        section:
            version 2
    realtime:
        ----------
        blocks:
            0
        extsz:
            4096
        rtextents:
            0
        section:
            none
            ```

### Merge requirements satisfied?
**[NOTICE] Bug fixes or features added to Salt require tests.**
<!-- Please review the [test documentation](https://docs.saltproject.io/en/master/topics/tutorials/writing_tests.html) for details on how to implement tests into Salt's test suite. -->
- [ ] Docs
- [ ] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
- [ ] Tests written/updated

### Commits signed with GPG?
Yes/No

Please review [Salt's Contributing Guide](https://docs.saltproject.io/en/master/topics/development/contributing.html) for best practices.

See GitHub's [page on GPG signing](https://help.github.com/articles/signing-commits-using-gpg/) for more information about signing commits with GPG.

[whytewolf]

@snichol123 Thank you for the PR, can you add a changelog file for this change?

[Ch3LL]

@whytewolf I went ahead and added a changelog file. Can you review please?