ceph-nvmeof-mon fixes


remove observer from NVMeofMon
Signed-off-by: Leonid Chernin leonidc.com
(cherry picked from commit a20fb90357990abac6d2696949e48ef4fa5a7880)


fix assert issue in find_failback_gw - failover_peers array was removed
Signed-off-by: Leonid Chernin leonidc.com
(cherry picked from commit 4c6a9b3ed194eb7837e6b341aba227042e497078)


try to resolve slow ops
It seems that if monitor preprocess_query(MonOpRequestRef op) returns
true, then  mon.reply_command() should be called. Remove path which
returns true without mon.reply_command() call.
(cherry picked from commit 99a345cb0d70851addc33aa3fa7fe07ed5d67b94)


Signed-off-by: Alexander Indenbaum aindenba
(cherry picked from commit f0b748db48dbe704de320974c40ea851e8ac061f)