svn merge -r 69806:70964 svn+ssh://svn.lindenlab.com/svn/linden/branches/Branch_1-18-3-Server --> release

Merge fixes applied directly to 1.18.3 for server deploy, through the sim rollout:
* Listen on the right port for the auditor, don't rely on catch-all
* Fix XMLRPC test object channel
* Various VAT fixes
* Make update_version_files more resilient
* Add class 502/510 for new datacenter
* Teleport metrics fixes
* DB schema update

Run even if server version files are not present (e.g. if we share this outside LL with a viewer source drop). Also a little bit of variable renaming to clarify what's going on, and more verbosity when requested.

Added tests to version manager and fixed failed tests.  Paired by rdw and Tess.