tox shows "WARNING:test command found but not installed in testenv"

[Mahito OGURA]

tox shows warning message as follow.

----
py27 runtests: PYTHONHASHSEED='0'
py27 runtests: commands[0] | find . -type f -name *.pyc -delete
WARNING:test command found but not installed in testenv
  cmd: /usr/bin/find
  env: /home/vagrant/rally/.tox/py27
Maybe you forgot to specify a dependency? See also the whitelist_externals envconfig setting.
py27 runtests: commands[1] | python setup.py testr --slowest --testr-args=
----

It seems that "find" command needs full path in tox.ini.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/190920

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/190920
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=f23863aa40df0dc7d88f9c88f7ae5af6b1cd97b7
Submitter: Jenkins
Branch: master

commit f23863aa40df0dc7d88f9c88f7ae5af6b1cd97b7
Author: Mahito OGURA <email address hidden>
Date: Fri Jun 12 13:45:57 2015 +0900

    Change "find" command path in tox.ini

    tox command shows WARNING message as follow.
    "WARNING:test command found but not installed in testenv"
    If we use "find" command in tox.ini, we should use the full path.
    This patch changes fix command path and remove the Warning message.

    Change-Id: Icb86ff2294ee79e500b98ef79e458f0302dc295e
    Closes-bug: 1464495