Merge branch 'stable-2.7' into stable-2.8

* stable-2.7:
  Fix: Performance issue when traversing large Git repositories

Conflicts:
	gerrit-server/src/main/java/com/google/gerrit/server/project/ProjectControl.java

Change-Id: Ic0c4d5c7ae41de558b8034223611ac71ecb40f01