Cleanup: The return

So we felt like doing some cleanup and drop some lazy maintainers.

Nightly.xml:
 Devices that got dropped out of nightly was because either the
 maintainers were lazy or the threads were too old (STILL on 4.3).
 Do NOT ABUSE THE NIGHTLY SYSTEM.

 Devices that got disabled are because the maintainers didn't keep up
 with the thread updates or are not following our guidelines and need
 to fix/update their threads.

Contributors.mkdn:
 Dropped some really lazy maintainers.

Change-Id: Icf03385fdaa75e28e1678967cbb7e8ffa4c816d6
Signed-off-by: Lokesh Chamane <lokesh.c703@gmail.com>
Merge "Cleanup: The return" into pac-4.4