Remove depreciated download cache

Change-Id: Iac3a2bf2a94f3a02d6bd4d12ee599398dc238d1d
diff --git a/turbo_hipster/task_plugins/real_db_upgrade/nova_mysql_migrations.sh b/turbo_hipster/task_plugins/real_db_upgrade/nova_mysql_migrations.sh
index 83893cc..b5ead37 100755
--- a/turbo_hipster/task_plugins/real_db_upgrade/nova_mysql_migrations.sh
+++ b/turbo_hipster/task_plugins/real_db_upgrade/nova_mysql_migrations.sh
@@ -185,7 +185,7 @@
 # Setup the environment
 set -x
 export PATH=/usr/lib/ccache:$PATH
-export PIP_DOWNLOAD_CACHE=$PIP_CACHE_DIR
+#export PIP_DOWNLOAD_CACHE=$PIP_CACHE_DIR
 #export PIP_INDEX_URL="http://www.rcbops.com/pypi/mirror"
 export PIP_INDEX_URL="http://pypi.openstack.org/simple/"
 export PIP_EXTRA_INDEX_URL="https://pypi.python.org/simple/"