client: log inode when waiting on max size

Logging the specific inode that the get_caps()
is waiting for helps during debugging of stuck waiters.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
client: Kick waiters for max size

If the mds restarts without successfully logging a max size
cap update, the client waits indefinitely in Client::get_caps
on the waitfor_caps list.  So when the client gets an mds map
indicating a new active mds has replaced a down mds, we need to
kick the caps update request.  This patch mimics the behavior
in the kernel by setting the wanted_max_size
and requested_max_size to 0 and wakes up the waiters.

Fixes #4582.
Signed-off-by: Sam Lang <sam.lang@inktank.com>
Merge pull request #191 from ceph/wip-4582b

Fixes #4582.

Reviewed-by: Greg Farnum <greg@inktank.com>
Merge remote-tracking branch 'gh/next'