Set python version 3.7

onappylog is incompatible with python 3.8

Issue-ID: MULTICLOUD-866
Signed-off-by: Bin Yang <Bin.Yang@windriver.com>
Change-Id: I97e5e12ffbc4af56a27a3a3239a4462d27daf586
(cherry picked from commit 1450ce809405b3f9242115e281af9fbb1ad849b8)
1 file changed