Making stat1003 use /srv instead of /a

This creates  $misc::statistics::base::working_path variable and attempts
to use that instead of a hardcodd /srv or /a.  It gets a little
tricky on stat1001 where /srv was already used as a place to symlink
some site document roots.

I will attempt to move stat1001 and stat1002 slowly over to using /srv.

Change-Id: I09768826e48c8eb73a6fc12e60b210af5b4d47a5