Change the type of a specific field in an event to enum

[kimhanbeom]

Background

• related link: Modify event struct and add migration code #285 (comment)

Detail Task

• Change the field of the event detected from a specific protocol to an enum. (The definition of the enum will be finalized after it is implemented in the ingest module and the giganto-client module, and I will comment on it further)

<target event & field>

• HttpThreat, DomainGenerationAlgorithm, NonBrowser, BlockListHttp: rep_mine_types, state
• BlockListConn: conn_state
• BlockListSmtp: state

Additional Infomation

• This issue should be done after the "Update to Support giganto-client v0.17.0 and review-protocol v0.3.0 and oinq v0.13.0" issue registered in the repository that covers product-wide issues is completed.