More MockResolver tests #677

Job	Run time
Full verify (8)	1m 44s
Setup ITs	4s
Unit tests (8)	2m 2s
Build (8)	1m 6s
Scylla ITs (ENTERPRISE-RELEASE, 8)	1h 30m 14s
Cassandra ITs (RELEASE-3.X, 8)	32m 8s
Scylla ITs (ENTERPRISE-PRIOR-RELEASE, 8)	1h 30m 17s
Cassandra ITs (RELEASE-4.X, 8)	27m 28s
Scylla ITs (OSS-RELEASE, 8)	11m 43s
Scylla ITs (OSS-PRIOR-RELEASE, 8)	11m 37s
Scylla ITs (ENTERPRISE-RC, 8)	12m 22s
Scylla ITs (OSS-RC, 8)	12m 42s
	4h 53m 27s

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