Fill protocol field in Kong routes when translating to expression routes

[randmonkey]

As suggestion from gateway team, it is better to put protocols in protocols field of Kong routes, instead of adding net.protocol == *** in expressions.

Currently the parser will put protocol matchers in expressions, including adding the default (net.protocol == "http") || (net.protocol) == “https”. We should move the matching rules of protocols into protocols field of translated Kong routes, as we did for traditional router.

Acceptance Criteria

• When generate expression based Kong routes, protocols are put in protocols field of routes but not in Expressions