Revert "Remove E3Experiments and LastModified submodules"

Git gets upset

This reverts commit 6278219e320fe414779656b59da44276592ca222

Change-Id: Icf26b89187b9fc9a27b13f9d4a21efe9a684a640
Merge "Revert "Remove E3Experiments and LastModified submodules"" into wmf/1.21wmf12