allow people to not purge passenger yumrepo

The idea is that people can switch between the different available nginx
repos. in case somebody switched from the passenger one to the upstream
repo we want to purge the passenger repo. However this gets us intro
trouble if the person never switched, but another module declares a
resource with this name.

manifests/init.pp

@@ -168,6 +168,7 @@
   $nginx_upstreams                                           = {},
   $nginx_servers                                             = {},
   $nginx_servers_defaults                                    = {},
+  Boolean $purge_passenger_repo                              = true,
   ### END Hiera Lookups ###
 ) inherits nginx::params {
 

manifests/package/redhat.pp

@@ -21,6 +21,7 @@
   $package_flavor           = $nginx::package_flavor
   $passenger_package_ensure = $nginx::passenger_package_ensure
   $manage_repo              = $nginx::manage_repo
+  $purge_passenger_repo     = $nginx::purge_passenger_repo
 
   #Install the CentOS-specific packages on that OS, otherwise assume it's a RHEL
   #clone and provide the Red Hat-specific package. This comes into play when not
@@ -43,11 +44,12 @@
           before   => Package['nginx'],
         }
 
-        yumrepo { 'passenger':
-          ensure => absent,
-          before => Package['nginx'],
+        if $purge_passenger_repo {
+          yumrepo { 'passenger':
+            ensure => absent,
+            before => Package['nginx'],
+          }
         }
-
       }
       'nginx-mainline': {
         yumrepo { 'nginx-release':
@@ -60,11 +62,12 @@
           before   => Package['nginx'],
         }
 
-        yumrepo { 'passenger':
-          ensure => absent,
-          before => Package['nginx'],
+        if $purge_passenger_repo {
+          yumrepo { 'passenger':
+            ensure => absent,
+            before => Package['nginx'],
+          }
         }
-
       }
       'passenger': {
         if ($facts['os']['name'] in ['RedHat', 'CentOS']) and ($facts['os']['release']['major'] in ['6', '7']) {