Don't make root CA if it exists

To support multinode testing where we just copy the CA to all the
instances don't remake the CA if it already exists.

The end result is that you can trusty a single chain and all your
clients will be happy regardless of which host they are talking to.

Change-Id: I90892e6828a59fa37af717361a2f1eed15a87ae4

lib/tls

@@ -322,6 +322,7 @@ function make_root_CA {
     create_CA_base $ca_dir
     create_CA_config $ca_dir 'Root CA'
 
+    if [ ! -r "$ca_dir/cacert.pem" ]; then
         # Create a self-signed certificate valid for 5 years
         $OPENSSL req -config $ca_dir/ca.conf \
             -x509 \
@@ -331,6 +332,7 @@ function make_root_CA {
             -keyout $ca_dir/private/cacert.key \
             -out $ca_dir/cacert.pem \
             -outform PEM
+    fi
 }
 
 # If a non-system python-requests is installed then it will use the
@@ -507,7 +509,7 @@ function cleanup_CA {
         sudo update-ca-certificates
     fi
 
-    rm -rf "$DATA_DIR/CA" "$DEVSTACK_CERT"
+    rm -rf "$INT_CA_DIR" "$ROOT_CA_DIR" "$DEVSTACK_CERT"
 }
 
 # Tell emacs to use shell-script-mode