Install Python3.6 for Ubuntu images

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

Change-Id: Ie6a1afde8a4697f094a862bfd0870fc5a844bf47
Issue-ID: CIMAN-108
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
1 file changed