Do not call lcb_server_send_packets() for each relocated packet

This function will be called per-server after relocation

Change-Id: Ieee91013c02d65d5fc484a63038572d2ba280d72
Reviewed-on: http://review.couchbase.org/28330
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>