cephadm: init config and keyring with None

[mgfritch]

and we should not assume that both config and keying are specified
when calling this method. because, for instance, create_daemon_dirs()
does handle the case where config and/or keyring is not specified.

this is a follow-up fix of 245d6a5

Signed-off-by: Kefu Chai kchai@redhat.com
Signed-off-by: Michael Fritch mfritch@suse.com

Checklist

• References tracker ticket
• Updates documentation if necessary
• Includes tests for new functionality or reproducer for bug

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[mgfritch]

fixes traceback when no config/keyring specified:

Traceback (most recent call last):
  File "/root/cephadm", line 4247, in <module>
    r = args.func()
  File "/root/cephadm", line 935, in _infer_fsid
    return func()
  File "/root/cephadm", line 2603, in command_ceph_volume
    (config, keyring) = get_config_and_keyring()
  File "/root/cephadm", line 1358, in get_config_and_keyring
    if not config:
UnboundLocalError: local variable 'config' referenced before assignment

[sebastian-philipp]

#34102

[bk201]

tested locally and works, no longer see the referenced before assignment issue.

[sebastian-philipp]

Backport depends on #34168