Use zuul-cloner in tox.ini as used project-config

[Sanket Sudake]

zuul-cloner is efficient in cloning repos. We need to use same in tox.ini as used project-config omni zuul job.

We can zuul dependency in test-requirements.txt and zuul-cloner can be called to clone repos in required paths.

Replace "," with "%" in driver files to handle error "TypeError: not enough arguments for format string"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/483847

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/483847
Committed: https://git.openstack.org/cgit/openstack/omni/commit/?id=84b9c632f500e9b6efbd07bbeb73e266afd517c2
Submitter: Jenkins
Branch: master

commit 84b9c632f500e9b6efbd07bbeb73e266afd517c2
Author: Pratik Shah <email address hidden>
Date: Fri Jul 14 12:50:57 2017 +0530

    Modified tox.ini to clone repos using zuul-cloner

    Replaced "," with "%" in logs statement for files:
    - cinder/volume/drivers/aws/ebs.py
    - cinder/volume/drivers/gce/gceutils.py
    - glance/glance_store/_drivers/aws.py
    - neutron/neutron/common/gceutils.py
    - neutron/neutron/plugins/ml2/drivers/gce/mech_gce.py
    - neutron/neutron/plugins/ml2/managers.py
    - neutron/neutron/services/l3_router/gce_router_plugin.py
    - nova/virt/ec2/ec2driver.py
    - nova/virt/gce/driver.py
    - nova/virt/gce/gceutils.py

    Added import fix in nova/tests/unit/virt/ec2/test_ec2.py

    Modified run_tests.sh to get total number of passed and failed tests

    Closes-Bug: #1704147

    Change-Id: I4b144b8095cf9ff4807c4b9f4ca21577a43de27f