cephfs admin: in the test setup code, delay a bit to fetch mgr map
cephfs admin: in the test setup code, delay a bit to fetch mgr map

When the ceph client code has not yet (asynchronously) gotten the mgr
map, it can return -EACCES when we run the MgrCommand function.  We
before continuing with the test function to get the fsadmin we delay a
bit so that we are more likely to have the mgr map before continuing.
This change also fixes the caching of the fs admin.

Signed-off-by: John Mulligan <eda8ad33169deab44f9fe65847f99e368da6c91b@redhat.com>

ceph/go-ceph,ceph/go-ceph,ceph/go-ceph