qa: workunits: mon: test mon caps permissions

set env var TEST_EXIT_ON_ERROR=0 to obtain all errors instead of exiting
with return 1 on first error found.

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: fix command caps check

We must require something or else the caps check is going to pass in
a degenerate sense.  Use X for commands.

Signed-off-by: Sage Weil <sage@inktank.com>
mon/MonCap: simplify rwx match logic

Make this a positive check instead of double negative.

Signed-off-by: Sage Weil <sage@inktank.com>
qa/workunits/mon/caps.sh: clean up users; rename

Signed-off-by: Sage Weil <sage@inktank.com>
Merge remote-tracking branch 'gh/wip-mon-caps' into next

Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>