[Thinkit] Add support to report metrics in TestEnvironment, Remove SetParams from GenericTestbedInterface, Add operator== to InterfaceInfo to help with unit testing, Take p4_info as a test paramter in thinkit::GenericTextbedFixture, Add support for the PINS control device to use a custom P4Info, Template GenericTestbedFixture to support custom parameters & Normalize thinkit testfixture param accessors.

[Thinkit] Add support to report metrics in TestEnvironment, Remove SetParams from GenericTestbedInterface, Add operator== to InterfaceInfo to help with unit testing, Take p4_info as a test paramter in thinkit::GenericTextbedFixture, Add support for the PINS control device to use a custom P4Info, Template GenericTestbedFixture to support custom parameters & Normalize thinkit testfixture param accessors. #1988