Revert "Trying to use mariadb md, just to see whether it helps"

This reverts commit 4d2f6cda39.

postgresql.yaml

@@ -2,13 +2,11 @@
 document: modulemd
 version: 2
 data:
-    summary: MariaDB Module
-    description: MariaDB is a community developed branch of MySQL.
-                 MariaDB is a multi-user, multi-threaded SQL database server.
-                 It is a client/server implementation consisting of a server
-                 daemon (mysqld) and many different client programs and
-                 libraries. The base package contains the standard
-                 MariaDB/MySQL client programs and generic MySQL files.
+    summary: PostgreSQL module
+    description: PostgreSQL is an advanced Object-Relational database
+                 management system (DBMS).
+                 The PostgreSQL server can be found in the
+                 postgresql-server sub-package.
     license:
         module: [MIT]
     dependencies:
@@ -18,34 +16,29 @@ data:
               platform: []
     references:
         community: https://docs.pagure.org/modularity/
-        documentation: https://github.com/container-images/mariadb/
-        tracker: https://github.com/modularity-modules/mariadb
+        documentation: https://www.postgresql.org/docs/
+        tracker: https://github.com/modularity-modules/postgresql
+    api:
+        rpms:
+            - postgresql
+            - postgresql-server
     profiles:
         default:
             rpms:
-                - mariadb
-                - mariadb-server
+                - postgresql-server
         server:
             rpms:
-                - mariadb-server
+                - postgresql-server
         client:
             rpms:
-                - mariadb
-    api:
-        rpms:
-            - mariadb
-            - mariadb-server
-    filter:
-        rpms:
-            - mariadb-bench
-            - mariadb-server-galera
+                - postgresql
+    filter: {}
     buildopts:
         rpms:
             macros: |
                 %runselftest 0
     components:
         rpms:
-            # mariadb-10.1 from f26
-            mariadb:
-                rationale: MariaDB  package.
-                ref: 76a52e56
+            postgresql:
+                rationale: main server component
+                ref: 3f21ecc4    # latest f27