more changes to new style of "module load" and "load".

Under FreeBSD, the filename_completion used in the above commands does
not work. Not sure why, but on passing i note that the function is
part of readline and is not reentrant, so it needs to be fixed one way
or another.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47664 65c4cc65-6c06-0410-ace0-fbb531ad65f3