Add some hooks for managers when service starts

Adds pre_start_hook() and post_start_hook() and fixes a couple of hard
coded binary name checks in service.py

Change-Id: I062790a88ed7f15a6f28961d6ddc1f230e19e0cb

nova/manager.py

@@ -183,10 +183,30 @@ class Manager(base.Base):
                               locals())
 
     def init_host(self):
-        """Handle initialization if this is a standalone service.
+        """Hook to do additional manager initialization when one requests
+        the service be started.  This is called before any service record
+        is created.
 
         Child classes should override this method.
+        """
+        pass
 
+    def pre_start_hook(self):
+        """Hook to provide the manager the ability to do additional
+        start-up work before any RPC queues/consumers are created. This is
+        called after other initialization has succeeded and a service
+        record is created.
+
+        Child classes should override this method.
+        """
+        pass
+
+    def post_start_hook(self):
+        """Hook to provide the manager the ability to do additional
+        start-up work immediately after a service creates RPC consumers
+        and starts 'running'.
+
+        Child classes should override this method.
         """
         pass