Azure: Increase verbosity for Tox task
This allows to debug issues happened during packages installation:
> -v, --verbose increase verbosity of reporting output.
-vv mode turns off output redirection for package installation,
above level two verbosity flags are passed through to pip (with two less
level) (default: 0)
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>