Change genearator config file type from tox to oslo-config-generator

[kexiaodong]

When install kuryr with devstack, current script will use "tox -egenconfig" to generator new sample config file.
I try 10 times to use devstack to install kuryr, but the script alway stopped at generator config.
The reason is that tox will remote all python library at the first time and then download again.
That will be a big problem in those country that public network is not good enough. In those country you can not download all packages successfully in one time. You always need try again and again.
I think we need change "tox -egenconfig" to "oslo-config-generator --config-file=etc/kuryr-config-generator.conf".
So that when you try enough times, you can install kuryr successfully.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/259731

[OpenStack Infra (hudson-openstack)]

Change abandoned by kexiaodong (<email address hidden>) on branch: master
Review: https://review.openstack.org/259731
Reason: merge conflict

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260914
Committed: https://git.openstack.org/cgit/openstack/kuryr/commit/?id=1f86c28000600c88aa9b6e4648dcb6b46f5c3bb8
Submitter: Jenkins
Branch: master

commit 1f86c28000600c88aa9b6e4648dcb6b46f5c3bb8
Author: kexiaodong <email address hidden>
Date: Wed Dec 23 00:37:37 2015 -0800

    Change generator config file from tox to oslo-config-generator

    When restart tox script it will remove all python libraries and
    download libraries again. In the case that git/pip frequently
    timeout, this may cause failure of installation.
    Closes-Bug: #1527961

    Change-Id: I4671bb8436f38686c1ca638ea33a797bd23389a0