stream-tcp, stream-ssl: Remove unneeded getsockname() calls.

Commit a8d819675f3 (Remove stream, vconn, and rconn functions to get
local/remote IPs/ports.) removed the code that used the local socket
address but neglected to remove the code to fetch that address.  This
commit removes the latter code also.

Reported-by: Eitan Eliahu <eliahue@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>