Now applying some puppet manifests in parallel

This will speed up the case where we are installing on
multiple machines, this commit makes use of flock to wrap
puppet apply so that packstack can ssh to a machine and apply
puppet in the background moving on to the next manifest. flock
ensures they are not run simultaniously if on the same machine.

packstack/modules/ospluginutils.py

@@ -28,16 +28,31 @@ class NovaConfig(object):
         entry += "}"
         return entry
 
+class ManifestFiles(object):
+    def __init__(self):
+        self.filelist = []
+
+    # continuous manifest file that have the same marker can be 
+    # installed in parallel, if on different servers
+    def addFile(self, filename, marker):
+        for f,p in self.filelist:
+            if f == filename:
+                return
+        self.filelist.append((filename, marker,))
+
+    def getFiles(self):
+        return [f for f in self.filelist]
+manifestfiles = ManifestFiles()
+
 def getManifestTemplate(template_name):
     with open(os.path.join(PUPPET_TEMPLATE_DIR, template_name)) as fp:
         return fp.read()%controller.CONF
 
-def appendManifestFile(manifest_name, data):
+def appendManifestFile(manifest_name, data, marker=''):
     if not os.path.exists(basedefs.PUPPET_MANIFEST_DIR):
         os.mkdir(basedefs.PUPPET_MANIFEST_DIR)
     manifestfile = os.path.join(basedefs.PUPPET_MANIFEST_DIR, manifest_name)
-    if manifestfile not in controller.CONF['CONFIG_MANIFESTFILES']:
-        controller.CONF['CONFIG_MANIFESTFILES'].append(manifestfile)
+    manifestfiles.addFile(manifestfile, marker)
     with open(manifestfile, 'a') as fp:
         fp.write("\n")
         fp.write(data)
@@ -56,5 +71,3 @@ def gethostlist(CONF):
                 if host not in hosts:
                     hosts.append(host)
     return hosts
-
-