Restore shunned server (due to replication lag) state on commit, provided that the replication lag is below the maximum threshold. #94

Job	Run time
cache / lock	3s
cache / lock	1h 16m 8s
cache / builds	0s
cache / unlock	4s
cache / unlock	2s
run	0s
cache / builds (centos7)	4s
cache / builds (debian10)	2s
cache / builds (debian11)	2s
cache / builds (opensuse15, -clang)	4s
cache / builds (ubuntu16)	4s
cache / builds (ubuntu22, -clang)	7s
cache / builds (ubuntu22, -tap)	3s
cache / builds (ubuntu22, -tap-asan)	8s
run / select	3s
run / tests (tests)	1h 27m 18s
run / tests (tests_with_deps/deprecate_eof_support)	11m 38s
	2h 55m 50s

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