Record and retrieve table creation timestamp

Extend the magnetodb.table_info table with an additional
"creation_date_time" column to store the creation timestamp of each table.
Return the creation timestamp in relevant REST API calls.

For consistency, renamed the last_updated column to last_update_time_date.

Closes-Bug: #1298814

Change-Id: I02b920b866529027655802c4d880f7557329824a
Merge "Record and retrieve table creation timestamp"