Tests

doc: improve HACKING.md (#484) #390

Job	Run time
Run Unit tests	2m 45s
Build microceph snap	6m 41s
Multi node testing with custom microceph IP	4m 46s
Multi node testing	6m 47s
Test MicroCeph Cluster features.	2m 50s
Test with loopback file OSDs	2m 37s
Test MicroCeph Remote Replication features.	8m 50s
Single node with encryption	6m 44s
Test quincy upgrades	7m 57s
Test reef upgrades	7m 23s
Test WAL/DB device usage	2m 24s
	59m 44s

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