osd, test: Add test case with osd support for overdue PG scrubs and deep scrubs

osd, test: Add test case with osd support for overdue PG scrubs and deep scrubs

Add trigger_deep_scrub osd command for testing
Publish stats when trigger_scrub/trigger_deep_scrub is used for testing
Add optional argument to trigger_scrub/trigger_deep_scrub
for amount of extra time to change last scrub stamps

Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit ef2dc05de00fbc5db8d864f83ee8d318286b6d6e)

Conflicts:
        src/osd/OSD.cc : Resolved in test_ops

Modify osd-scrub-repair.sh from master branch version to use mimic
mon_warn_not_scrubbed and mon_warn_not_deep_scrubbed config values.

(cherry picked from commit fcd582f62f7939e1e6488d215f5c074b3dc95ced)

Conflicts:
	src/osd/OSD.cc (trivial)
	src/osd/PG.h (trivial, location of set_last_scrub_stamp())