Remove require relationship on python

The python package declaration was removed in 11fe6a76, so the require
relationship between python-greenlet and the python package is no
longer needed and causes errors. The python-greenlet package will have
python as a dependency if it is not already installed, so there is no
reason to make this relationship explicit.

Change-Id: I783a3a0b1d305a491e710621acd26f55b5979a90

manifests/init.pp

@@ -384,7 +384,6 @@ class nova(
   # they should be handled as package deps by the OS
   package { 'python-greenlet':
     ensure  => present,
-    require => Package['python'],
   }
 
   if $install_utilities {

spec/classes/nova_init_spec.rb

@@ -9,7 +9,6 @@ describe 'nova' do
       it 'installs packages' do
         should contain_package('python-greenlet').with(
           :ensure  => 'present',
-          :require => 'Package[python]'
         )
         should contain_package('python-nova').with(
           :ensure  => 'present',