The pylint setup related to pip and upper constraints
is different for python3.9. Updated the requirement packages'
software version (to versions that support python3.9) Updated
'cover' tox.ini target to be python3.9
These alarms are suppressed because python2 does not support the
suggested syntax, will be unsuppressed after termination of python2
W0707: raise-missing-from
W1514: unspecified-encoding
Test Plan :
1. Ensure Tox can pass on both Debain and CentOS build server
2. Ensure pylint3 and pylint3.9 can pass without warning
Signed-off-by: BoYuan Chang <boyuan.chang@windriver.com>
Story: 2008943
Task: 45941
Change-Id: I4981b98002f5842df9fec31a3991916b84592c07
b190ab3221