Create non-root ttp-parent

Create non-root ttp-parent

Fixes forking issue due to aggregate javadoc declaration in root pom to
generate the javadocs. Because every module inherits ttp-parent they all
fork subprocesses to generate javadoc due to the aggregate setting. This
should not happen as long as we make sure nothing inherits from the root
pom.

Change-Id: Idf0aaed065d63936bea6d854afa9b156183394ef
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>