Added arm64 jobs in Travis-CI

[ossdev07]

Travis-CI has added support for ARM64. Added ARM64 jobs in Travis-CI.

[rhenwood-arm]

I think this would read better as touch $/.ssh/known_hosts

[ossdev07]

Ping @mfschwartz @houglum I have added the echo 'KEY' >> $HOME/.ssh/known_hosts as 1 test was failing on aarch64 because of the below issue, please have a look:

ERROR: test_timeout (tests.unit.manage.test_ssh.TestSSHTimeout)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/ossdev07/boto/tests/unit/manage/test_ssh.py", line 48, in test_timeout
    test = SSHClient(server)
  File "/home/travis/build/ossdev07/boto/boto/manage/cmdshell.py", line 62, in __init__
    self._ssh_client.load_host_keys(os.path.expanduser(host_key_file))
  File "/home/travis/virtualenv/python3.6.9/lib/python3.6/site-packages/paramiko/client.py", line 127, in load_host_keys
    self._host_keys.load(filename)
  File "/home/travis/virtualenv/python3.6.9/lib/python3.6/site-packages/paramiko/hostkeys.py", line 95, in load
    with open(filename, "r") as f:
FileNotFoundError: [Errno 2] No such file or directory: '/home/travis/.ssh/known_hosts'

Please share your thoughts on this PR.

[houglum]

I no longer maintain gsutil, but before I handed it off to the new owners, I actually created a fork of boto/boto for gsutil to use because it looks like the Boto team is abandoning this library in favor of boto3. Even if you can get a PR accepted, the Boto team hasn't shown activity on this repo in quite a while, so it's unlikely they'll release a new version anytime soon. If you rely on this repo and need to submit fixes, I'd recommend making your own fork as well.

[ossdev07]

Ping @mfschwartz Could you please have a look at this PR.

[mfschwartz]

@ossdev07 - I agree with @houglum's suggestion to make your own boto fork with this change. Boto isn't getting maintained well any more so if you need it I think you should plan to maintain your own fork (or find a way to migrate to boto3).