roachtest: loss of quorum recovery test

Roachtest that exercises end to end functionality of loss of
quorum recovery.
This functionality supplements unit tests that verify different
stages of recovery process and rests on local cluster with more
real world scenario of workload database having its range quorum
broken and then recovered to workable state.
The test itself never fails if recovery is not successful as we don't
expect recovery to succeed in all cases. It is recording the outcome
as a perf metric to track if it is successful over time.

Release note: None

Release justification: Test only code for new functionality on 22.1.

pkg/cmd/roachtest/option/node_list_option.go

@@ -53,6 +53,9 @@ func (n NodeListOption) Merge(o NodeListOption) NodeListOption {
 	t := make(NodeListOption, 0, len(n)+len(o))
 	t = append(t, n...)
 	t = append(t, o...)
+	if len(t) == 0 {
+		return t
+	}
 	sort.Ints(t)
 	r := t[:1]
 	for i := 1; i < len(t); i++ {

pkg/cmd/roachtest/tests/BUILD.bazel

@@ -69,6 +69,7 @@ go_library(
         "libpq_blocklist.go",
         "liquibase.go",
         "liquibase_blocklist.go",
+        "loss_of_quorum_recovery.go",
         "many_splits.go",
         "mixed_version_decommission.go",
         "mixed_version_jobs.go",