param: Make socket_address common, Revert 611ef42053eb99f4c29d4efa86eaea9f1ca06286

param: Make socket_address common, Revert 611ef42053eb99f4c29d4efa86eaea9f1ca06286

This essentially reverts the commit 611ef42053eb99f4c29d4efa86eaea9f1ca06286
Author: Yasuma Takeda <yasuma@osstech.co.jp>
Date:   Fri Dec 5 13:37:51 2008 -0800

    Fix bug #5944 - nmbd does not boot if socket adress = "" is defined in smb.conf

Intead, the documentation is fixed so that the correct default is
recorded.  Removing the special case handling here allows this to be
dealt with in the same way as all other parameters.

Andrew Bartlett