Make PgPool PCP package name configurable on RHEL

At the moment, the PgPool package can be specified manually, but the
corresponding pcp package on RHEL cannot. This patch allows for that,
keeping the existing defaults. A patch is not needed for EPAS, as it
does not make use of such a package.

roles/setup_pgpool2/tasks/pgpool2_install.yml

@@ -29,7 +29,7 @@
 
 - name: Install pgpool-II-pcp package on RedHat
   ansible.builtin.package:
-    name: "pgpool-II-pcp"
+    name: "{{ pgpool2_pcp_package_name }}"
     state: present
   when:
     - ansible_os_family == 'RedHat'

roles/setup_pgpool2/vars/PG_RedHat.yml

@@ -2,6 +2,7 @@
 pgpool2_version: 4.3
 # We don't have the choice of the version with community PostgreSQL
 pgpool2_package_name: "pgpool-II"
+pgpool2_pcp_package_name: "pgpool-II-pcp"
 pgpool2_configuration_file: "/etc/pgpool-II/pgpool.conf"
 pgpool2_pool_passwd_file: "/etc/pgpool-II/pool_passwd"
 pgpool2_user: "postgres"