mgr: relax "pending_service_map.epoch > service_map.epoch" assert

[trociny]

When we are activating we may receive several service map updates
initiated by the previous active mgr. Treat them all as initial map.

The code also adds "pending_service_map_dirty == 0" assert, which we
expect is true when receiving an initial map -- otherwise we can't
just initialize pending_service_map with received map.

Fixes: https://tracker.ceph.com/issues/51835
Signed-off-by: Mykola Golub mgolub@suse.com

Checklist

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[trociny]

jenkins test make check

[sseshasa]

Teuthology Test Result:

http://pulpito.front.sepia.ceph.com/yuriw-2022-06-13_16:36:31-rados-wip-yuri7-testing-2022-06-13-0706-distro-default-smithi/
Found no related Failures

[ljflores]

http://pulpito.front.sepia.ceph.com/yuriw-2022-06-13_16:36:31-rados-wip-yuri7-testing-2022-06-13-0706-distro-default-smithi/

Failures, unrelated:
1. https://tracker.ceph.com/issues/55986
2. https://tracker.ceph.com/issues/52321
3. https://tracker.ceph.com/issues/52124
4. https://tracker.ceph.com/issues/52316
5. https://tracker.ceph.com/issues/55322
6. https://tracker.ceph.com/issues/55741
7. https://tracker.ceph.com/issues/56034 --> new Tracker; unrelated to the PRs in this run.

Details:
1. cephadm: Test failure: test_cluster_set_reset_user_config (tasks.cephfs.test_nfs.TestNFS) - Ceph - Orchestrator
2. qa/tasks/rook times out: 'check osd count' reached maximum tries (90) after waiting for 900 seconds - Ceph - Orchestrator
3. Invalid read of size 8 in handle_recovery_delete() - Ceph - RADOS
4. qa/tasks/mon_thrash.py: _do_thrash AssertionError len(s['quorum']) == len(mons) - Ceph - RADOS
5. test-restful.sh: mon metadata unable to be retrieved - Ceph - Mgr
6. cephadm/test_dashboard_e2e.sh: Unable to find element cd-modal .custom-control-label when testing on orchestrator/01-hosts.e2e-spec.ts - Ceph - Mgr - Dashboard
7. qa/standalone/osd/divergent-priors.sh fails in test TEST_divergent_3() - Ceph - RADOS