Automatically include mod_expires if required via vhost directories

Similar to other options passed in the vhost's directory this now
inspects the directories entry and if expires_* is passed, mod_expires
is included.

manifests/vhost.pp

@@ -2362,6 +2362,10 @@
       if 'setenv' in $directory {
         include apache::mod::env
       }
+
+      if 'expires_active' in $directory or 'expires_default' in $directory or 'expires_by_type' in $directory {
+        include apache::mod::expires
+      }
     }
 
     # Template uses:

spec/defines/vhost_spec.rb

@@ -593,6 +593,7 @@
           it { is_expected.to contain_class('apache::mod::authz_groupfile') }
           it { is_expected.to contain_class('apache::mod::auth_gssapi') }
           it { is_expected.to contain_class('apache::mod::env') }
+          it { is_expected.to contain_class('apache::mod::expires') }
           it { is_expected.to contain_class('apache::mod::filter') }
           it { is_expected.to contain_class('apache::mod::headers') }
           it { is_expected.to contain_class('apache::mod::mime') }