feat(cmd) implement kong config db_export command

[kikito]

No description provided.

[hbagdi]

basic-auth credentials are hashed in the database. Should we skip exporting them?

[kikito]

@hbagdi Unsure about this. If I'm understanding the crypto algorithm correctly, it uses the consumer id as salt, and such ids are also exported. So exported and reimported credentials should work, if they accompany their Consumers.

If your concern is not whether we could but whether we should ... well that's where I don't know.

I guess we could add a filter option to the export command line (something like kong config db_export except=basic_auth_credentials,snis). But for 1.3.0 we're definitively going with the "getting the basic functionality out and running". It is expected that we'll iterate over this a bit in future versions, or at least that's my understanding.

[hbagdi]

@hbagdi Unsure about this. If I'm understanding the crypto algorithm correctly, it uses the consumer id as salt, and such ids are also exported. So exported and reimported credentials should work, if they accompany their Consumers.

We will be exporting a hashed password and ID of the consumer.
Importing it again will probably lead to another round of hash with the salt (as we don't have a way of knowing if a password is already hashed or not) and the password won't work on the proxy path.