The constraints file used for tox.ini was removed. We need to
update the file to use the StarlingX Debian constraints file.
Test Plan:
PASS - Run tox command
Closes-bug: 2055734
Change-Id: I306be11f6edc4538cbb3f7a164bac9e1ad08501f
Signed-off-by: Hugo Brito <hugo.brito@windriver.com>