Add minsize_1 test

tests/test_minsize_1.sh

@@ -0,0 +1,17 @@
+#!/bin/bash -ex
+
+PG_MINSIZE=1
+SCHEME=replicated
+
+. `dirname $0`/run_3osds.sh
+
+kill -INT $OSD1_PID
+kill -INT $OSD2_PID
+
+sleep 5
+
+if ! ($ETCDCTL get /vitastor/pg/state/1/ --prefix --print-value-only | jq -s -e '[ .[] | select(.state == ["active", "degraded"]) ] | length == '$PG_COUNT); then
+    format_error "FAILED: $PG_COUNT PG(s) NOT ACTIVE+DEGRADED"
+fi
+
+format_green OK