Revert "Add Constraints support"

Per http://lists.openstack.org/pipermail/openstack-dev/2017-December/125348.html

> For many projects, tox_install.sh is not needed at all

Let's see if that holds for python-swiftclient!

This reverts commit f2f278fcbe.

Change-Id: I0462c50ec71d87bac226f83a0d0942871ef5a0e7

bindep.txt

@@ -1,7 +1,6 @@
 # This is a cross-platform list tracking distribution packages needed by tests;
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
-curl
 pypy [test !platform:fedora]
 pypy-dev [test platform:dpkg]
 pypy-devel [test platform:rpm !platform:fedora]

tools/tox_install.sh

@@ -1,30 +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="$1"
-shift 1
-
-set -e
-
-# NOTE(tonyb): Place this in the tox enviroment's log dir so it will get
-# published to logs.openstack.org for easy debugging.
-localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
-
-if [[ "$CONSTRAINTS_FILE" != http* ]]; then
-    CONSTRAINTS_FILE="file://$CONSTRAINTS_FILE"
-fi
-# NOTE(tonyb): need to add curl to bindep.txt if the project supports bindep
-curl "$CONSTRAINTS_FILE" --insecure --progress-bar --output "$localfile"
-
-python -m pip install -c"$localfile" openstack-requirements
-
-# This is the main purpose of the script: Allow local installation of
-# the current repo. It is listed in constraints file and thus any
-# install will be constrained and we need to unconstrain it.
-python "$(which edit-constraints)" "$localfile" -- $CLIENT_NAME
-
-python -m pip install -c"$localfile" -U "$@"
-exit $?

tox.ini

@@ -5,13 +5,11 @@ skipsdist = True
 
 [testenv]
 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}
+install_command = python -m pip install -U {opts} {packages}
 list_dependencies_command = python -m pip freeze
 setenv =
   LANG=en_US.utf8
   VIRTUAL_ENV={envdir}
-  BRANCH_NAME=master
-  CLIENT_NAME=python-swiftclient
 
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
@@ -35,9 +33,7 @@ commands = python setup.py testr --coverage
            coverage report
 
 [testenv:func]
-setenv =
+setenv = OS_TEST_PATH=tests.functional
-    {[testenv]setenv}
-    OS_TEST_PATH=tests.functional
 whitelist_externals =
     coverage
     rm