Update devstack's Tempest integration

Split build_ci_config.sh into:
* tools/build_tempest.sh - checks out Tempest and installs prereqs
* tools/configure_tempest.sh - creates tempest.conf from devstack

Change-Id: I22f40226afb617a5a6e32f2631b07d5509f10b13
diff --git a/tools/build_uec_ramdisk.sh b/tools/build_uec_ramdisk.sh
index 3bd704b..174eaac 100755
--- a/tools/build_uec_ramdisk.sh
+++ b/tools/build_uec_ramdisk.sh
@@ -149,7 +149,7 @@
 git_clone $HORIZON_REPO $DEST/horizon $HORIZON_BRANCH
 git_clone $NOVACLIENT_REPO $DEST/python-novaclient $NOVACLIENT_BRANCH
 git_clone $OPENSTACKX_REPO $DEST/openstackx $OPENSTACKX_BRANCH
-git_clone $CITEST_REPO $DEST/tempest $CITEST_BRANCH
+git_clone $TEMPEST_REPO $DEST/tempest $TEMPEST_BRANCH
 
 # Use this version of devstack
 rm -rf $MNT_DIR/$DEST/devstack