Remove the sample configuration file for keystone

This commit just makes sure that the configuration file for keystone
exists on the system. We use iniset to actually populate the values
we want before we run keystone anyway.

This results in a cleaner configuration file that isn't bloated with
comments and help text.

Change-Id: I7a1f879e9e242a11e2c4663ec116e33da28db7f5
diff --git a/lib/keystone b/lib/keystone
index 714f089..696e351 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -202,7 +202,7 @@
     sudo install -d -o $STACK_USER $KEYSTONE_CONF_DIR
 
     if [[ "$KEYSTONE_CONF_DIR" != "$KEYSTONE_DIR/etc" ]]; then
-        install -m 600 $KEYSTONE_DIR/etc/keystone.conf.sample $KEYSTONE_CONF
+        install -m 600 /dev/null $KEYSTONE_CONF
         if [[ -f "$KEYSTONE_DIR/etc/keystone-paste.ini" ]]; then
             cp -p "$KEYSTONE_DIR/etc/keystone-paste.ini" "$KEYSTONE_PASTE_INI"
         fi
@@ -220,7 +220,7 @@
         inidelete $KEYSTONE_PASTE_INI composite:admin \\/v2.0
     fi
 
-    # Rewrite stock ``keystone.conf``
+    # Populate ``keystone.conf``
     if is_service_enabled ldap; then
         iniset $KEYSTONE_CONF identity domain_config_dir "$KEYSTONE_CONF_DIR/domains"
         iniset $KEYSTONE_CONF identity domain_specific_drivers_enabled "True"