rename nginx.pp to nginx.selmodule

we have to provide a binary file with new selinux rules
naming convention is <name>.pp, but this triggers travis-ci
to interpret the file as puppet code which fails

Author: Tim Meusel

files/nginx.pp

@@ -54,7 +54,7 @@
   if $selinux_config_mode == 'enforcing' {
     file{'get-SEL-policy':
       path    => '/usr/share/selinux/targeted/nginx.pp',
-      source  => 'puppet:///modules/puppet/nginx.pp',
+      source  => 'puppet:///modules/puppet/nginx.selmodule',
     } ->
     package {'policycoreutils':
       ensure  => 'latest',