remove asher, py from icinga access; use wikitech names for authz

the cgi.cfg file needs the ldap usernames (the cn) for all
of the authorized_for* variables.  use them with lowercase;
note that therefore folks must login with lowercase too.

Change-Id: Ia2e5dc761449848359db93810a33d0b6d9c7b0f2
Merge "remove asher, py from icinga access; use wikitech names for authz" into production