Add retry for secondary pool mirroring #1588

Job	Run time
Run Unit tests	1m 22s
Build microceph snap	12m 26s
Multi node testing	8m 16s
Test with loopback file OSDs	2m 27s
Multi node testing with custom microceph IP	6m 49s
Test MicroCeph Cluster features.	2m 55s
Single node with encryption	6m 45s
Test quincy upgrades	14m 51s
Test MicroCeph Remote Replication features.	9m 0s
Test WAL/DB device usage	2m 24s
	1h 7m 15s

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