Allow module_hotfixes in validate_yum_hash

... as it's a valid parameter to the
yumrepo resource.

Change-Id: Icfd4dda893c7ff49c9675b165b3bc8d4c6730f94
Signed-off-by: Tobias Urdin <tobias.urdin@binero.com>

lib/puppet/functions/validate_yum_hash.rb

@@ -19,6 +19,7 @@ Puppet::Functions.create_function(:validate_yum_hash) do
       'metadata_expire',
       'metalink',
       'mirrorlist',
+      'module_hotfixes',
       'priority',
       'protect',
       'provider',