Omit test plugins as they are not used by the tests and already deleted

debian/mariadb-test.install

@@ -2,20 +2,6 @@ usr/bin/mysql_client_test
 usr/bin/mysql_client_test_embedded
 usr/bin/mysqltest
 usr/bin/mysqltest_embedded
-usr/lib/*/mariadb18/plugin/adt_null.so
-usr/lib/*/mariadb18/plugin/auth_0x0100.so
-usr/lib/*/mariadb18/plugin/auth_test_plugin.so
-usr/lib/*/mariadb18/plugin/daemon_example.ini
-usr/lib/*/mariadb18/plugin/debug_key_management.so
-usr/lib/*/mariadb18/plugin/dialog_examples.so
-usr/lib/*/mariadb18/plugin/example_key_management.so
-usr/lib/*/mariadb18/plugin/ha_example.so
-usr/lib/*/mariadb18/plugin/ha_test_sql_discovery.so
-usr/lib/*/mariadb18/plugin/libdaemon_example.so
-usr/lib/*/mariadb18/plugin/mypluglib.so
-usr/lib/*/mariadb18/plugin/qa_auth_client.so
-usr/lib/*/mariadb18/plugin/qa_auth_interface.so
-usr/lib/*/mariadb18/plugin/qa_auth_server.so
 usr/share/man/man1/mysql-stress-test.pl.1
 usr/share/man/man1/mysql-test-run.pl.1
 usr/share/man/man1/mysql_client_test.1