Install Python3.6 for Ubuntu basebuild images

Add Python3.6 version to be used by dcaegen2
project.

Change-Id: I7bd5f28958144cbf16e22c1328f5683ee30d737a
Issue-ID: CIMAN-108
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
1 file changed