Allow to run tests in containers in parallel

Signed-off-by: Chenxiong Qi <cqi@redhat.com>

docker/test.sh

@@ -1,21 +1,18 @@
-#!/bin/bash
+#!/bin/bash -ex
+
+mkdir -p ~/mbs
+rsync -a --exclude '.*' --exclude '*.pyc' $PWD ~/mbs
+
+cd ~/mbs/src
 
 # We install the python-koji RPM but it doesn't register as installed through pip.
 # This hacks keeps tox from install koji from PyPi.
-cp requirements.txt requirements.txt.orig
 sed -i '/koji/d' requirements.txt
-# Delete any leftover compiled Python files
-for dir in module_build_service tests; do
-    find ${dir} -type f \( -name '*.pyc' -or -name '*.pyc' \) -exec rm -f {} \;
-done
+
 # The python-virtualenv package bundles a very old version of pip,
 # which is incompatible with modern virtualenv.
 rm -f /usr/lib/python2.7/site-packages/virtualenv_support/pip-9*
+
 # Since tox seems to ignore `usedevelop` when we have `sitepackages` on, we have to run it manually
 python setup.py develop --no-deps
 /usr/bin/tox -e flake8,py27 "$@"
-rv=$?
-# After running tox, we can revert back to the original requirements.txt file
-rm -f requirements.txt
-mv requirements.txt.orig requirements.txt
-exit $rv