tox -e genconfig doesnt generate sample conf file

[Goutham Pratapa]

Currently, when we run `tox -e genconfig` it doesn't generate sample configuration file.

and fails with the following error

genconfig runtests: commands[0] | oslo-config-generator --config-file=config-generator.conf
Traceback (most recent call last):
 File "/Users/vamsis/projects/openstack/kingbird/.tox/genconfig/bin/oslo-config-generator", line 11, in <module>
   sys.exit(main())
 File "/Users/vamsis/projects/openstack/kingbird/.tox/genconfig/lib/python2.7/site-packages/oslo_config/generator.py", line 764, in main
   conf(args, version=version)
 File "/Users/vamsis/projects/openstack/kingbird/.tox/genconfig/lib/python2.7/site-packages/oslo_config/cfg.py", line 2502, in __call__
   raise ConfigFilesNotFoundError(self._namespace._files_not_found)
oslo_config.cfg.ConfigFilesNotFoundError: Failed to find some config files: /Users/vamsis/projects/openstack/kingbird/config-generator.conf
ERROR: InvocationError for command '/Users/vamsis/projects/openstack/kingbird/.tox/genconfig/bin/oslo-config-generator --config-file=config-generator.conf' (exited with code 1)
_________________________________________________________________________________________________ summary __________________________________________________________________________________________________
ERROR: genconfig: commands failed

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/566025

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/566025
Committed: https://git.openstack.org/cgit/openstack/kingbird/commit/?id=c1a9a255ac0d6ba7f94f1541b559b94d913998b0
Submitter: Zuul
Branch: master

commit c1a9a255ac0d6ba7f94f1541b559b94d913998b0
Author: Vamsi Surapureddi <email address hidden>
Date: Thu May 3 16:35:19 2018 +0530

    Fixes tox genconfig

    Change-Id: I4ca5179efdc217c6dd545961456009606bd911a6
    Closes-bug: #1768806