Lack go native testing on Authorizer and Filter role

[yookoala]

The testing on Authorizer and Filter depends on node-fastcgi.

It would be preferable to have golang native testing. We, however, cannot depend on the net/http/fcgi library because it only implemented the Responder role. Helps to resolve #2.

TODO

• expand the protocol, if needed, so we can write dummy fcgi application (probably without real socket connection).
• write dummy fcgi Authorizer application.
• write dummy fcgi Filter application.
• test Authorizer and Filter client implementations.

[yookoala]

Closed by mistake.