Plugins refactor

- Replaced CONFIG_<OS-component>_HOST(S) parameters for CONFIG_CONTROLLER_HOST,
  CONFIG_COMPUTE_HOSTS and CONFIG_NETWORK_HOSTS to minimize count of potential
  deployment architecture to maintainable level
- Unified coding style in plugins, PEP8-tized and forced pep8 check on them

Implements: blueprint simplification

Change-Id: I597f209b62d8d0c3709bb446cb33c804509eef9f

packstack/puppet/templates/keystone_swift.pp

@@ -1,4 +1,4 @@
 class { 'swift::keystone::auth':
-  public_address  => '%(CONFIG_SWIFT_PROXY)s',
+  public_address  => '%(CONFIG_CONTROLLER_HOST)s',
   password => '%(CONFIG_SWIFT_KS_PW)s',
 }