fix galera sst tests

note that ${A#foo} is $A if there's no prefix foo. That's why
galera nodes tried to connect to 127.0.0.1:127.0.0.1 if there was
no port in the address

Followup for 2b35db5a

scripts/wsrep_sst_common.sh

@@ -41,15 +41,14 @@ case "$1" in
             addr_no_bracket=${WSREP_SST_OPT_ADDR#\[}
             readonly WSREP_SST_OPT_HOST_UNESCAPED=${addr_no_bracket%%\]*}
             readonly WSREP_SST_OPT_HOST="[${WSREP_SST_OPT_HOST_UNESCAPED}]"
-            remain=${WSREP_SST_OPT_ADDR#*\]}
-            remain=${remain#*:}
             ;;
         *)
             readonly WSREP_SST_OPT_HOST=${WSREP_SST_OPT_ADDR%%[:/]*}
             readonly WSREP_SST_OPT_HOST_UNESCAPED=$WSREP_SST_OPT_HOST
-            remain=${WSREP_SST_OPT_ADDR#*:}
             ;;
         esac
+        remain=${WSREP_SST_OPT_ADDR#${WSREP_SST_OPT_HOST}}
+        remain=${remain#:}
         readonly WSREP_SST_OPT_ADDR_PORT=${remain%%/*}
         remain=${remain#*/}
         readonly WSREP_SST_OPT_MODULE=${remain%%/*}