[Bug 2019293] [NEW] mgr: relax "pending_service_map.epoch > service_map.epoch" assert

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[Impact]

This issue has been observed from ubuntu Octopus release. 
An assert will be triggered during the mgr fail-over process if the new active one unexpectedly received two continuous service map update. 
The upstream fix has relaxed the assert condition to allow the new active mgr to receive multiple service map update in a fail-over scenario. 

[Test Case]

1. Deploy a 15.2.16 ceph cluster

2. upgrade it to 15.2.17, inject multiple service map to the monitor

3. stop the active mgr

4. observe the new active mgr will hit the assert condition


[Potential Regression]
The new active mgr would be required to process multiple service map, it might slow down a little bit on the fail-over process, but still much better than crash.


[Other info]

Upstream bug tracker: https://tracker.ceph.com/issues/51835
Upstream PR: https://github.com/ceph/ceph/pull/45984
we need to backport it to octopus

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch sts sts-sru-needed
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mgr: relax "pending_service_map.epoch > service_map.epoch" assert
https://bugs.launchpad.net/bugs/2019293
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