MB-8574: Cleanup manifest file for master branch

This commit doesn't change the contents, but just remove
redundant parts to make the whole file easier to read
and edit.

The projects are now sorted alphabetically.

Change-Id: I8132b3e8ce7e0d9bdae57cd2a53a91c762b108e1
Reviewed-on: http://review.couchbase.org/27310
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>