tidb does not support SHARD_ROW_ID_BITS now

Merge pull request #7 from Xen-On-core/smplfy_fk_patch

Add foreign key constraint to table creation procedure.

Merge pull request #5 from Xen-On-core/add_pg_path_options

Delete inst_path.patch

Added --postgresql-path option. This is necessary if your PostgreSQL is not installed in the default directory.

support partition for cockroach

support split for yugabyte

fix an typo

enable update and delete

support oceanbase

always enable some settings in yugabyte

optimize setting print

support settings

update yugabyte: don't use psql