output message when not doing dbupdate. put quotes in to fix bash error when ZM_DB_HOST is not defined

distros/ubuntu1504_cmake/zoneminder.postinst

@@ -17,10 +17,12 @@ if [ "$1" = "configure" ]; then
     # Ensure zoneminder is stopped
     deb-systemd-invoke stop zoneminder.service || exit $?
 
-	if [ $ZM_DB_HOST == "localhost" ]; then
+	if [ "$ZM_DB_HOST" == "localhost" ]; then
 		echo 'grant lock tables, create, index, alter on zm.* to 'zmuser'@localhost identified by "zmpass";' | mysql --defaults-file=/etc/mysql/debian.cnf mysql
 		# Run the ZoneMinder update tool
 		zmupdate.pl --nointeractive
+	else
+		echo "Not doing database upgrade due to remote db server ($ZM_DB_HOST)"
 	fi;
 
 fi