Use --no-site-package for services venv's (-nova)

The --system-site-packages option essentially removes the benefits of
virtualenv, nova is a special case because it depends on python-libvirt
which can't be installed via pip.

Change-Id: Ifc3580d4b59a5f1e97de77c0c4a875b123208100

elements/boot-stack/install.d/01-boot-stack

@@ -63,6 +63,8 @@ git clone https://github.com/stackforge/diskimage-builder.git /opt/stack/diskima
 
 # db
 install-packages mysql-server python-mysqldb
+# required to build MySQL-pyton
+install-packages libmysqlclient-dev
 
 my_cnf=
 if [ -f /etc/mysql/my.cnf ]; then

elements/os-svc-install/bin/os-svc-install

@@ -10,7 +10,12 @@ function python-install() {
   local svc_root=$2
 
   pushd /opt/stack/venvs
-  virtualenv --system-site-packages $name
+  SITE_PCKGS="--no-site-packages"
+  # Nova depends on python-libvirt which can't be installed via pip
+  if [ $name == "nova" ]; then
+    SITE_PCKGS="--system-site-packages"
+  fi
+  virtualenv $SITE_PCKGS $name
   popd
 
   set +u
@@ -28,6 +33,8 @@ function python-install() {
   if [ -n "$reqs" ] ; then
     PIP_INDEX_URL=http://pypi.openstack.org/openstack/ \
        pip install -r $reqs
+       # FIXME: pip requires doesn't include MySQL-python
+       pip install MySQL-python
   fi
 
   $pip_install $svc_root