Fix bug in replica lock release in the mem store (#1535) #1661

Job	Run time
Build Reaper	5m 56s
Docker Image Tests (cassandra, docker)	7m 39s
HTTP Management (binary:4.0.6, ccm, http-api, 1, 1)	25m 20s
Memory backends (binary:3.0.25, local, ccm)	17m 8s
HTTP Management (binary:3.11.16, ccm, http-api, 1, 1)	22m 43s
Cassandra backend (binary:3.0.25, cassandra, ccm)	19m 51s
Memory backends (binary:3.11.16, local, ccm)	18m 20s
Memory backends (binary:4.0.6, local, ccm)	23m 21s
Cassandra backend (binary:3.11.16, cassandra, ccm)	22m 32s
Cassandra backend (binary:4.0.6, cassandra, ccm)	25m 26s
Flapping reapers (binary:4.0.6, cassandra, ccm, 4, 2, --tags ~@diag_event_subscriptions)	25m 29s
Each DC Availability (binary:4.0.6, cassandra, each, 1, 1)	21m 0s
Distributed tests (binary:3.0.25, cassandra, ccm, 2, 2)	21m 12s
Sidecar (binary:3.0.25, cassandra, sidecar, 1, 1)	2m 54s
Distributed tests (binary:3.11.16, cassandra, ccm, 2, 2)	23m 13s
Sidecar (binary:3.11.16, cassandra, sidecar, 1, 1)	2m 55s
Distributed tests (binary:4.0.6, cassandra, ccm, 2, 2)	26m 15s
Sidecar (binary:4.0.6, cassandra, sidecar, 1, 1)	2m 36s
Release Reaper	0s
	5h 13m 50s

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