run_tests.sh fails to create venv

[IWAMOTO Toshihiro]

current version (1.1) of pip doesn't have "install -E" option, resulting in the following error.

/opt/stack/melange$ bash run_tests.sh
No virtual environment found...create one? (Y/n) y
done.
Creating venv... done.
Installing pip in virtualenv... done.
Installing dependencies with pip (this can take a while)...
Usage: /opt/stack/melange/.venv/bin/pip install [OPTIONS] PACKAGE_NAMES...

/opt/stack/melange/.venv/bin/pip install: error: no such option: -E
Command "tools/with_venv.sh pip install -E /opt/stack/melange/.venv greenlet" failed.

[IWAMOTO Toshihiro (iwamoto)]

openstack/nova removed use of "-E" a while ago.

commit de5e6ea29efe02de42d95109e22bdd0039789f1b
Author: Mark McLoughlin <email address hidden>
Date: Thu Sep 29 15:06:54 2011 +0100

    install_venv: refactor out pip_install helper

    We don't need to pass the -E argument since we're already running
    inside the virtualenv.

    Change-Id: Idd77b9bdc067e2288d0fa694a2bb6769675065cf