Revert "Install simplejson in devstack venv"

This reverts commit 6990b06cd321930f69907ba42ee744755f8029fe. This
should no longer be necessary as packages are requiring simplejson.

Change-Id: I74b0f93457f91e7d53d54737d52f67075088faca
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
diff --git a/inc/python b/inc/python
index 857f1f2..bd58905 100644
--- a/inc/python
+++ b/inc/python
@@ -42,9 +42,6 @@
         # available on pypi.
         $PYTHON -m venv --system-site-packages "${DEVSTACK_VENV}"
         pip_install -U pip setuptools[core]
-        #NOTE(rpittau): workaround for simplejson removal in osc
-        #  https://review.opendev.org/c/openstack/python-openstackclient/+/920001
-        pip_install -U simplejson
     fi
     if [[ ":$PATH:" != *":$DEVSTACK_VENV/bin:"* ]] ; then
         export PATH="$DEVSTACK_VENV/bin:$PATH"