Asyncio ga2

[yuce]

Some small and big fixes and improvements to mostly the asyncio client, but some asyncore as well:

• Check the existence of event handlers in *Map proxies.
• Cluster get_member must use the correct variable
• Compact schema send retry, blocking cloud discovery refresh
• Create tasks for conn.close_connection calls.
• Fix ConnectionManager start_connect_all_members task
• Fixed the deadlock in asyncio listener
• Fixed the race condition in ProxyManager.get_or_create
• Fixed the race condition in _handle_successful auth
• Fixed wrong method retries in VC
• Remove the write loop in reactor
• VC put_if_absent must copy the passed document before updating it.