(profile::core::puppet_master) install oauth gem in puppet agent env

puppet6 aio bundles the oauth gem but it is not bundled with puppet7
aio.  Most of the native types in `theforeman/foreman` require this gem
to be present.

See: theforeman/puppet-foreman#1077

Author: jhoblitt

site/profile/manifests/core/puppet_master.pp

@@ -194,4 +194,9 @@
 
   # for bmc management
   ensure_packages(['ipmitool'])
+
+  package { 'oauth':
+    ensure   => installed,
+    provider => 'puppet_gem',
+  }
 }

spec/hosts/roles/foreman_spec.rb

@@ -165,6 +165,8 @@
       ],
     )
   end
+
+  it { is_expected.to contain_package('oauth').with_provider('puppet_gem') }
 end
 
 role = 'foreman'