build-unit-test-docker: Install in /usr/local

cmake and autotools by default install their outputs into /usr/local.
Some of our installed artifacts are being explicitly placed into /usr.
Make all of our installed artifacts consistently install into
/usr/local. This will be useful later for merging our customizations
from multiple input images.

Change-Id: I3ddecf565a590aa717a9359d71304efe0a24994f
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed