Cleanup keystone's removed config options

token.provider.drvier.uuid and token.driver
has been removed from keystone[1].

Devstack has reference/setting of those config
options which is confusing for user and it can
lead to import error like[2]

This commit cleanup the devstack bits of removed
config options.

bp removed-as-of-rocky

[1] https://blueprints.launchpad.net/keystone/+spec/removed-as-of-rocky

[2] http://paste.openstack.org/show/725391/

Change-Id: I29b3b356622c485c4c1046679234a38e7b645071

Author: ghanshyam

lib/keystone

@@ -63,9 +63,6 @@ else
     KEYSTONE_DEPLOY=mod_wsgi
 fi
 
-# Select the token persistence backend driver
-KEYSTONE_TOKEN_BACKEND=${KEYSTONE_TOKEN_BACKEND:-sql}
-
 # Select the Identity backend driver
 KEYSTONE_IDENTITY_BACKEND=${KEYSTONE_IDENTITY_BACKEND:-sql}
 
@@ -79,7 +76,8 @@ KEYSTONE_ROLE_BACKEND=${KEYSTONE_ROLE_BACKEND:-sql}
 KEYSTONE_RESOURCE_BACKEND=${KEYSTONE_RESOURCE_BACKEND:-sql}
 
 # Select Keystone's token provider (and format)
-# Choose from 'uuid', 'pki', 'pkiz', or 'fernet'
+# Refer keystone doc for supported token provider:
+# https://docs.openstack.org/keystone/latest/admin/token-provider.html
 KEYSTONE_TOKEN_FORMAT=${KEYSTONE_TOKEN_FORMAT:-fernet}
 KEYSTONE_TOKEN_FORMAT=$(echo ${KEYSTONE_TOKEN_FORMAT} | tr '[:upper:]' '[:lower:]')
 
@@ -245,8 +243,6 @@ function configure_keystone {
 
     iniset $KEYSTONE_CONF database connection `database_connection_url keystone`
 
-    iniset $KEYSTONE_CONF token driver "$KEYSTONE_TOKEN_BACKEND"
-
     # Set up logging
     if [ "$SYSLOG" != "False" ]; then
         iniset $KEYSTONE_CONF DEFAULT use_syslog "True"
@@ -443,11 +439,6 @@ function init_keystone {
     $KEYSTONE_BIN_DIR/keystone-manage --config-file $KEYSTONE_CONF db_sync
     time_stop "dbsync"
 
-    if [[ "$KEYSTONE_TOKEN_FORMAT" == "pki" || "$KEYSTONE_TOKEN_FORMAT" == "pkiz" ]]; then
-        # Set up certificates
-        rm -rf $KEYSTONE_CONF_DIR/ssl
-        $KEYSTONE_BIN_DIR/keystone-manage --config-file $KEYSTONE_CONF pki_setup
-    fi
     if [[ "$KEYSTONE_TOKEN_FORMAT" == "fernet" ]]; then
         rm -rf "$KEYSTONE_CONF_DIR/fernet-keys/"
         $KEYSTONE_BIN_DIR/keystone-manage --config-file $KEYSTONE_CONF fernet_setup