Do a proper tls/ca cleanup in unstack

Certificates and the index were left in the data directory after
running unstack. That would break devstack on the next run.

partial blueprint devstack-https
Change-Id: I6eb552a76fb29addf4d02254c027e473d6805df1
diff --git a/lib/tls b/lib/tls
index 02906b7..a84bb76 100644
--- a/lib/tls
+++ b/lib/tls
@@ -18,6 +18,9 @@
 # - configure_proxy
 # - start_tls_proxy
 
+# - stop_tls_proxy
+# - cleanup_CA
+
 # - make_root_CA
 # - make_int_CA
 # - make_cert ca-dir cert-name "common-name" ["alt-name" ...]
@@ -372,6 +375,22 @@
 }
 
 
+# Cleanup Functions
+# ===============
+
+
+# Stops all stud processes. This should be done only after all services
+# using tls configuration are down.
+function stop_tls_proxy {
+    killall stud
+}
+
+
+# Remove CA along with configuration, as well as the local server certificate
+function cleanup_CA {
+    rm -rf "$DATA_DIR/CA" "$DEVSTACK_CERT"
+}
+
 # Tell emacs to use shell-script-mode
 ## Local variables:
 ## mode: shell-script