updated defaults for mon_max_pg_per_osd variable.
Added additional alerts for pg number on osds.

Change-Id: I5042a166c6c81923c630d05bd7e2499226a707d6
Related-Prod: PROD-26472
(cherry picked from commit c49630e2ea639e406b542dd9fdeddb98ecf4a8bc)
4 files changed