Adds tests for cdb_tablemetadatatouch  - fixes tableoid by using the proper table oid  - tests quoted and unqouted call with OID  - tests non existent table to fail
Adds tests for cdb_tablemetadatatouch
 - fixes tableoid by using the proper table oid
 - tests quoted and unqouted call with OID
 - tests non existent table to fail

CartoDB/cartodb-postgresql,CartoDB/cartodb-postgresql