Parametrize purging of unmanaged nrpe configs

Signed-off-by: Nick Chappell <nick@intronic.org>

Merged from: https://github.com/Icinga/puppet-icinga2/pull/39

refs#7673: https://dev.icinga.org/issues/7673

manifests/nrpe/config.pp

@@ -24,7 +24,7 @@ class icinga2::nrpe::config inherits icinga2::nrpe {
     owner   => 'root',
     group   => 'root',
     mode    => '0755',
-    purge   => true,
+    purge   => $nrpe_purge_unmanaged,
     recurse => true,
     require => Package[$icinga2::params::icinga2_client_packages],
   }

manifests/params.pp

@@ -297,6 +297,9 @@ class icinga2::params {
   # Defaults to NOT allow command arguments
   $allow_command_argument_processing = '0'
 
+  # Whether or not to purge nrpe config files NOT managed by Puppet.
+  $nrpe_purge_unmanaged = false
+
   case $::operatingsystem {
     #File and template variable names for Red Had/CentOS systems:
     'CentOS': {