[DBClientAction] Change the file names related with DBClientAction.

This patch only changes the file name. Class names are unchanged.
[Params] Change a constant: DB_DOMAIN_ID_ACTION.

DB_DOMAIN_ID_ACTION ->
DB_TABLES_ID_ACTION
[DBTablesAction] Change the class name.

DBClientAction ->
DBTablesAction.
Merge pull request #424 from project-hatohol/rename-dbtables-action-2

Rename DBTables action 2