Make Python 3 based installs work

This moves to my fork of puppet-python as it contains a fix for
working with virtualenv >= 20. Otherwise this is just poking
puppet-python to cope with Fedora 33 *only* having Python 3,
which it makes it available as both `python` and `python3`.

See voxpupuli/puppet-python#578 for the
aforementioned virtualenv fix.

.gitmodules

@@ -39,4 +39,4 @@
 	url = https://github.com/puppetlabs/puppetlabs-inifile
 [submodule "modules/python"]
 	path = modules/python
-	url = https://github.com/voxpupuli/puppet-python
+	url = https://github.com/PeterJCLaw/puppet-python

modules/sr_site/manifests/init.pp

@@ -78,6 +78,7 @@
   }
 
   class { 'python':
+    version         => 'python3',
     manage_gunicorn => false,
     virtualenv      => present,
   }
@@ -97,9 +98,6 @@
       ensure    => present,
       provider  => 'pip3',
     }
-    package { 'python3-virtualenv':
-      ensure    => present,
-    }
 
     class { 'sr_site::openldap':
       require => File['/usr/local/var/sr'],

modules/www/manifests/code_submitter.pp

@@ -44,7 +44,7 @@
     group           => 'apache',
     distribute      => false,
     version         => '3',
-    require         => [Class['python'], Package['python3-virtualenv']],
+    require         => Class['python'],
     virtualenv      => 'python3 -m virtualenv',
     subscribe       => Vcsrepo[$root_dir],
   }

modules/www/manifests/ide.pp

@@ -155,7 +155,7 @@
     distribute      => false,
     version         => $python_version,
     requirements    => "${venv_dir}/lint-requirements.txt",
-    require         => [Class['python'], Package['python3-virtualenv']],
+    require         => Class['python'],
     virtualenv      => "python${$python_version} -m virtualenv",
   }