Fix Galera tests failures on 10.1 and 10.2

When we build server out of git directory , we did not copy
wsrep_sst_common into build-dir. This causes galera/wsrep tests
to fail

scripts/CMakeLists.txt

@@ -255,6 +255,7 @@ ELSE()
   IF(WITH_WSREP)
     SET(WSREP_SCRIPTS
       wsrep_sst_mysqldump
+      wsrep_sst_common
       wsrep_sst_rsync
       wsrep_sst_xtrabackup
       wsrep_sst_xtrabackup-v2