update/enable postgresql integration test target for rhel8 beta

Signed-off-by: Adam Miller <admiller@redhat.com>

test/integration/targets/postgresql/aliases

@@ -4,4 +4,3 @@ postgresql_db
 postgresql_privs
 postgresql_user
 skip/osx
-skip/rhel8.0

test/integration/targets/setup_postgresql_db/tasks/main.yml

@@ -96,6 +96,12 @@
 # instLangs parameter).
 
 - block:
+  - name: Install langpacks (rhel8 beta)
+    yum:
+      name: glibc-all-langpacks
+      state: present
+    when: ansible_distribution_major_version|int >= 8
+
   - name: Check if locales need to be generated (RedHat)
     shell: "localedef --list-archive | grep -a -q '^{{ locale }}$'"
     register: locale_present