amazon linux defaults to postgresql92 now, this workaround will let it install

Author: Shawn Sterling

manifests/params.pp

@@ -30,7 +30,7 @@
       $version_parts      = split($version, '[.]')
       $package_version    = "${version_parts[0]}${version_parts[1]}"
 
-      if $version == $postgresql::globals::default_version {
+      if $version == $postgresql::globals::default_version and $::operatingsystem != 'Amazon' {
         $client_package_name    = pick($client_package_name, 'postgresql')
         $server_package_name    = pick($server_package_name, 'postgresql-server')
         $contrib_package_name   = pick($contrib_package_name,'postgresql-contrib')