
We do not need tox_install.sh, pip can handle constraints itself and install the project correctly. Thus update tox.ini and remove the now obsolete tools/tox_install.sh file. This follows https://review.openstack.org/#/c/508061 to remove tools/tox_install.sh. Change-Id: I0b36f95fa92f15159156815bc6d8e1add8902182