Remove support for EOL Fedora 27 & 28

Also properly list support for Fedora 30, and improve
formatting in a when condition.

This addresses comments in PR86:
https://github.com/geerlingguy/ansible-role-postgresql/pull/86

meta/main.yml

@@ -14,9 +14,8 @@ galaxy_info:
         - 7
     - name: Fedora
       versions:
-        - 27
-        - 28
         - 29
+        - 30
     - name: Ubuntu
       versions:
         - all

tasks/variables.yml

@@ -6,7 +6,9 @@
 
 - name: Include OS-specific variables (RedHat).
   include_vars: "{{ ansible_os_family }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
-  when: ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora'
+  when:
+  - ansible_os_family == 'RedHat'
+  - ansible_distribution != 'Fedora'
 
 - name: Include OS-specific variables (Fedora).
   include_vars: "{{ ansible_distribution }}-{{ ansible_distribution_version.split('.')[0] }}.yml"

vars/Fedora-27.yml

@@ -1,11 +0,0 @@
----
-__postgresql_version: "9.6"
-__postgresql_data_dir: "/var/lib/pgsql/data"
-__postgresql_bin_path: "/usr/bin"
-__postgresql_config_path: "/var/lib/pgsql/data"
-__postgresql_daemon: postgresql
-__postgresql_packages:
-  - postgresql
-  - postgresql-server
-  - postgresql-contrib
-  - postgresql-libs

vars/Fedora-28.yml

@@ -1,11 +0,0 @@
----
-__postgresql_version: "10.5"
-__postgresql_data_dir: "/var/lib/pgsql/data"
-__postgresql_bin_path: "/usr/bin"
-__postgresql_config_path: "/var/lib/pgsql/data"
-__postgresql_daemon: postgresql
-__postgresql_packages:
-  - postgresql
-  - postgresql-server
-  - postgresql-contrib
-  - postgresql-libs