-releng and -devtools changes
-releng and -devtools changes

-releng
* Added #scap and #browser-tests-infrastructure
* Removed #Differential (moved to -devtools)

-devtools
* Added #GitHub-Mirrors, #Gerrit-Migration, #Differential, and #Diffusion
** Things related to Phabricator use, basically

Change-Id: I79b7b56b902b4951f205a91a25bd833453bb58f9

wikimedia/labs-tools-wikibugs2,wikimedia/labs-tools-wikibugs2