[Users] location table version should be upgraded

[Juha Heinanen]

i tried to start openser HEAD and got mysql error from usrloc.  it
turned out that the problem was new socket column that didn't exist in
my ser database.  i think it would be a good idea to increase location
table version so that it is easy to check if a particular version of
openser would work with a particular table version.  so location table
version should now be 7.

-- juha