Avoid tox_install.sh for constraints support

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: I84cee5a9a728b9d6dc7909ac28a60b9c20c2348c

tools/tox_install.sh

@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-
-# Client constraint file contains this client version pin that is in conflict
-# with installing the client from source. We should remove the version pin in
-# the constraints file before applying it for from-source installation.
-
-CONSTRAINTS_FILE=$1
-shift 1
-
-set -e
-
-localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
-
-if [[ $CONSTRAINTS_FILE != http* ]]; then
-    CONSTRAINTS_FILE=file://$CONSTRAINTS_FILE
-fi
-
-curl $CONSTRAINTS_FILE --insecure --progress-bar --output $localfile
-
-pip install -c$localfile openstack-requirements
-
-# This is the main purpose of the script: Allow local installation of
-# the current repo. It is listed in constraints file and thus any
-# install will be constrained and we need to unconstrain it.
-edit-constraints $localfile -- $CLIENT_NAME
-
-pip install -c$localfile -U $*
-exit $?

tox.ini

@@ -7,8 +7,10 @@ skipsdist = True
 setenv = VIRTUAL_ENV={envdir}
          CLIENT_NAME=python-heatclient
 usedevelop = True
-install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
-deps = -r{toxinidir}/requirements.txt
+install_command = pip install {opts} {packages}
+deps =
+       -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = find . -type f -name "*.py[c|o]" -delete
            python setup.py testr --slowest --testr-args='{posargs}'