Support CREATE DATABASE WITH DBPROPERTIES

Based on fe/src/main/cup/sql-parser.cup, currently Impala just supports the following syntax for CREATE DATABASE:

CREATE (DATABASE|SCHEMA) [IF NOT EXISTS] database_name[COMMENT 'database_comment']
  [LOCATION hdfs_path];

It'd be nice to add support for specifying the dbproperties, e.g.

CREATE DATABASE tempdb WITH DBPROPERTIES ('impala.disableHmsSync'='true');