the worker ID missing on worker reconnect

[Khai Do]

The worker ID is lost after the worker reconnects to the gearman server.

steps to repro:
1. run gearman server
2. create a gearman worker and set the worker ID
3. run/connect the worker to the server. Check that gearman is connected with gearadmin tool
4. stop the gearman server
5. start the gearman server again.
6. Check that gearman worker has reconnected with the server using the gearadmin tool.

Note - Worker is connected but, but worker ID is no longer set.

---- My Console Log ----
ubuntu@server:~$ gearadmin --worker
33 74.202.214.170 oneiric-668621-exec-0 : echo
34 127.0.0.1 - :
.
ubuntu@server:~$ gearadmin --shutdown
OK
ubuntu@server:~$ gearmand --log-file=gearmand.log --verbose=DEBUG &
[1] 5914
ubuntu@server:~$ gearadmin --worker
33 74.202.214.170 - : echo
34 127.0.0.1 - :
.