Fix broken unittest caused SiteDBv2 emulator
Merge pull request #4484 from giffels/sitedbv2-unittest-fix

Fix broken unittest caused SiteDBv2 emulator
Restore the T2_XX_SiteA/B/C sites, SEs and CEs

This is needed for WorkQueue unit tests to work
Merge pull request #4485 from dballesteros7/FixUnitTests

Restore the T2_XX_SiteA/B/C sites, SEs and CEs