tasks/cephfs: enable kclient for mds_* tasks

Signed-off-by: John Spray <john.spray@redhat.com>
tasks/cephfs: docstring in filesystem

Signed-off-by: John Spray <john.spray@redhat.com>
tasks/cephfs: enable osd epoch get from mounts

Using new hooks for #7317

Signed-off-by: John Spray <john.spray@redhat.com>
tasks: add mds_full task

This is for exercising the CephFS behaviour
when the cluster becomes full.

Signed-off-by: John Spray <john.spray@redhat.com>
tasks/kclient: add 'debug' option

Signed-off-by: John Spray <john.spray@redhat.com>
suites/fs: hook in mds_full task

Signed-off-by: John Spray <john.spray@redhat.com>
suites/kclient: hook in mds_full task

Signed-off-by: John Spray <john.spray@redhat.com>