envsetup: Add pstest

  An easy way to cherry pick patch submissions from AOKP's
  gerrit instance. Nice for at a glance tests, or when
  using a mobile device to ssh into a buildbox.
  (copying patches via the Android browswer is painful.)

  Patch Set 2: fix bad formatting.

Change-Id: I053a69137c7e0c33631ede138e65cbc16cbd36ba
Signed-off-by: KhasMek <Boushh@gmail.com>