WL#2732: Allow bind-interface from client

There has been an occasional request to allow configuring the client API
to connect *from* a particular interface. We could do this by reusing the
MYSQL_SET_CLIENT_IP mysql_options() flag, or by allowing bind-address in
the [client] (or other) section of the my.cnf.

i actually already did this in WL#3126 / WL#3127
-- hartmut


Already fixed in 5.5, this WL can be closed. See WL#3126 and WL#3127

/ Magnus