Add puppet hook option for --tags

Using --tags allows you to run a puppet manifest and only apply
a subset of the catalog. You can specify --tags package for
example to only install packages resources for a given
manifest.

The intent is to use this option alongside of the TripleO docker
work to selectively control what parts of a puppet manifest
get executed in a container.

Change-Id: Ic8b54c89e62cbe5074f256e29e10f59aa2ab0aae

hot/software-config/elements/heat-config-puppet/README.rst

@@ -8,3 +8,5 @@ Hook Options:
   use_facter: default True. Set to True to pass puppet inputs via Facter
   use_hiera: default False. Set to True to pass puppet inputs via Hiera
   modulepath: If set, puppet will use this filesystem path to load modules
+  tags: If set, puppet will use the specified value(s) to apply only a
+        subset of the catalog for a given manifest.

hot/software-config/elements/heat-config-puppet/install.d/hook-puppet.py

@@ -60,6 +60,7 @@ def main(argv=sys.argv):
     use_hiera = c['options'].get('enable_hiera', False)
     use_facter = c['options'].get('enable_facter', True)
     modulepath = c['options'].get('modulepath')
+    tags = c['options'].get('tags')
 
     facts = {}
     hiera = {}
@@ -103,6 +104,9 @@ def main(argv=sys.argv):
     if modulepath:
         cmd.insert(-1, '--modulepath')
         cmd.insert(-1, modulepath)
+    if tags:
+        cmd.insert(-1, '--tags')
+        cmd.insert(-1, tags)
     log.debug('Running %s %s' % (env_debug, ' '.join(cmd)))
     try:
         subproc = subprocess.Popen(cmd, stdout=subprocess.PIPE,

tests/software_config/test_hook_puppet.py

@@ -161,6 +161,7 @@ class HookPuppetTest(common.RunScriptTest):
         modulepath = self.working_dir.join()
         data = copy.deepcopy(self.data)
         data['options']['modulepath'] = modulepath
+        data['options']['tags'] = 'package,file'
         returncode, stdout, stderr = self.run_cmd(
             [self.hook_path], self.env, json.dumps(data))
 
@@ -184,6 +185,8 @@ class HookPuppetTest(common.RunScriptTest):
                 '--detailed-exitcodes',
                 '--modulepath',
                 modulepath,
+                '--tags',
+                'package,file',
                 puppet_script
             ],
             state['args'])