OPTIM: lb-first: do not take the server lock on take_conn/drop_conn

The operations are only an insert and a delete into the LB tree, which
doesn't require the server's lock at all as the lbprm lock is already
held. Let's drop it.

(cherry picked from commit 6b96e0e9d204bb7e30222964d641cc28a0e4d0c0)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed