Don't manage chmod for /etc/neutron and neutron.conf

Debian/Ubuntu & Fedora packaging use different modes that mean Puppet will
override the mode and break idempotency between runs.

This patch aims to drop the modes for /etc/neutron and neutron.conf to
ensure idempotency between runs.

[1] Second run of Puppet on Ubuntu:
/Stage[main]/Neutron/File[/etc/neutron]/mode: mode changed '0755' to
'0750'

Change-Id: I661b0ea94e151a47ab71355058f7ac971915c116

manifests/init.pp

@@ -310,12 +310,10 @@ class neutron (
     require => Package['neutron'],
     owner   => 'root',
     group   => 'neutron',
-    mode    => '0640',
   }
 
   file { '/etc/neutron':
     ensure => directory,
-    mode   => '0750',
   }
 
   file { '/etc/neutron/neutron.conf': }

spec/classes/neutron_init_spec.rb

@@ -78,7 +78,6 @@ describe 'neutron' do
         :ensure  => 'directory',
         :owner   => 'root',
         :group   => 'neutron',
-        :mode    => '0750',
         :require => 'Package[neutron]'
       )
     end
@@ -87,7 +86,6 @@ describe 'neutron' do
       is_expected.to contain_file('/etc/neutron/neutron.conf').with(
         :owner   => 'root',
         :group   => 'neutron',
-        :mode    => '0640',
         :require => 'Package[neutron]'
       )
     end