MDEV-4656 MariaDB-Galera deb packages cannot be built, expected files are missing.

Kristian changed the install directory for these files to share/mysql.
(that was changeset 3334.1.345 Fix wrong install location for DEB supportfiles.)
But dist/mariadb-galera-server.files weren't changed accordingly.
Here we fix them.

debian/dist/Debian/mariadb-galera-server-5.5.files

@@ -94,5 +94,5 @@ usr/share/mysql/mysql_system_tables_data.sql
 usr/share/mysql/mysql_system_tables.sql
 usr/share/mysql/mysql_performance_tables.sql
 usr/share/mysql/mysql_test_data_timezone.sql
-usr/support-files/wsrep.cnf
-usr/support-files/wsrep_notify
+usr/share/mysql/wsrep.cnf
+usr/share/mysql/wsrep_notify

debian/dist/Ubuntu/mariadb-galera-server-5.5.files

@@ -96,4 +96,5 @@ usr/share/mysql/mysql_system_tables_data.sql
 usr/share/mysql/mysql_system_tables.sql
 usr/share/mysql/mysql_performance_tables.sql
 usr/share/mysql/mysql_test_data_timezone.sql
-usr/support-files/wsrep.cnf
+usr/share/mysql/wsrep.cnf
+usr/share/mysql/wsrep_notify