Mark external About library as deprecated.

The alljoyn-about package is deprecated in favor of the internal About
functionality in liballjoyn.so.

This change also cleans up and simplifies a few things as well.

Change-Id: Id7a3767de91b3ec0271172148d2cbf7ecce19840
Signed-off-by: Steve Kinneberg <stevek@qce.qualcomm.com>