Improvements to DB setup

Don't fail if the database or user already exists.

Signed-off-by: Zane Bitter <zbitter@redhat.com>

bin/heat-db-setup-fedora

@@ -199,11 +199,9 @@ echo "Verified connectivity to MySQL."
 
 echo "Creating 'heat' database."
 cat << EOF | mysql -u root ${MYSQL_ROOT_PW_ARG}
-CREATE DATABASE heat;
-CREATE USER 'heat'@'localhost' IDENTIFIED BY '${MYSQL_HEAT_PW}';
-CREATE USER 'heat'@'%' IDENTIFIED BY '${MYSQL_HEAT_PW}';
-GRANT ALL ON heat.* TO 'heat'@'localhost';
-GRANT ALL ON heat.* TO 'heat'@'%';
+CREATE DATABASE IF NOT EXISTS heat;
+GRANT ALL ON heat.* TO 'heat'@'localhost' IDENTIFIED BY '${MYSQL_HEAT_PW}';
+GRANT ALL ON heat.* TO 'heat'@'%' IDENTIFIED BY '${MYSQL_HEAT_PW}';
 flush privileges;
 EOF