Ceph mon coredumps generated randomly

[Yvonne Ding]

Brief Description
-----------------
Ceph mon coredumps are generated randomly during Nova/Neutron regression running.

Severity
--------
Major

Steps to Reproduce
------------------
1. Run Nova/Neutron regression test suites

TC-name:
TestCoreDumpsAndCrashes::test_system_coredumps_and_crashes[core_dumps]

Expected Behavior
-----------------
There is no coredump failure

Actual Behavior
----------------
Coredump failure is created

System Configuration
--------------------
Regular standard 2+2

Lab-name:
wcp_7_10

Branch/Pull Time/Commit
-----------------------
BUILD_ID="r/stx.4.0"

Timestamp/Logs
--------------
1. controller-1_2020-07-17_03-45-13_core.ceph-mon.0.fb40533f47aa4a65b3c8eb91bec8172e.1481167.1594957494000000.xz
2. controller-1_2020-07-17_03-22-49_core.ceph-mon.0.fb40533f47aa4a65b3c8eb91bec8172e.92399.1594956145000000.xz
3. controller-0_2020-07-17_04-24-24_core.ceph-mon.0.e606444d84f044a0b989b5553c1671f0.216254.1594959827000000.xz

Three coredump files can be found here,
https://files.starlingx.kube.cengn.ca/launchpad/1888308

Test Activity
-------------
Test nova/neutron function with the openstack install system

[Ghada Khalil (gkhalil)]

Low priority - given this has no system impact