mgr/cephadm: skip ok-to-stop for mds in upgrade if not enough mds daemons

[adk3798]

Fixes: https://tracker.ceph.com/issues/50817

Signed-off-by: Adam King adking@redhat.com

Checklist

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

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[mgfritch]

I'm not sure this works since a . char is valid within an fs_name

for example:

$ ceph fs volume create a.b.c

[adk3798]

I'm not sure this works since a . char is valid within an fs_name

for example:

$ ceph fs volume create a.b.c

This now uses mds_daemon.service_name().split('.', 1)[1] to match the mds daemon to its fs. Since the service name we store is always mds.<fs-name> I think it should work regardless of the number of "." characters in the fs name or hostname of the host the daemon is on. Now also using Cephadm's HostCache to get the number of daemons rather than the mds metadata since it's too difficult to match the mds daemons in the metadata to the correct fs.

[mgfritch]

jenkins test make check

[sebastian-philipp]

https://pulpito.ceph.com/swagner-2021-06-15_14:12:12-rados:cephadm-wip-swagner-testing-2021-06-15-1350-distro-basic-smithi/