(MODULES-9219) - puppetlabs-postgresql : catalog compilation fails when the service command is not installed

The service command is deprecated and is not installed by default on
modern Redhat releases.  Updated class parameters to define the service
status and service reload commands based on what OS is installed on the node.

Author: Michael Watters

manifests/params.pp

@@ -78,10 +78,33 @@
         }
         $confdir                = pick($confdir, $datadir)
       }
+
+      case $::operatingsystem {
+        'Amazon': {
+          $service_reload = "service ${service_name} reload"
+          $service_status = "service ${service_name} status"
+        }
+
+        # RHEL 5 uses SysV init, RHEL 6 uses upstart.  RHEL 7 and 8 both use systemd.
+        'RedHat', 'CentOS', 'Scientific', 'OracleLinux': {
+          if $::operatingsystemrelease =~ /^[78].*/ {
+            $service_reload = "systemctl reload ${service_name}"
+            $service_status = "systemctl status ${service_name}"
+          } else {
+            $service_reload = "service ${service_name} reload"
+            $service_status = "service ${service_name} status"
+          }
+        }
+
+        # Default will catch Fedora which uses systemd
+        default: {
+          $service_reload = "systemctl reload ${service_name}"
+          $service_status = "systemctl status ${service_name}"
+        }
+      }
+
       $psql_path           = pick($psql_path, "${bindir}/psql")
 
-      $service_status      = $service_status
-      $service_reload      = "service ${service_name} reload"
       $perl_package_name   = pick($perl_package_name, 'perl-DBD-Pg')
       $python_package_name = pick($python_package_name, 'python-psycopg2')