lib/param: Rename "socket address" to "nbt client socket address" to clarify role

lib/param: Rename "socket address" to "nbt client socket address" to clarify role

This parameter is only used in our NBT client code and in nmbd as a
fallback when we fail to select a better interface from "interfaces"
to use directly.

Andrew Bartlett

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri Jul 27 12:16:25 CEST 2012 on sn-devel-104