Edit gRPC-request cache

[NymanRobin]

Currently the gRPC-request cache limits functionality for stub testing.

Example scenario: gRPC server has several different services and each one has a own proto file.

The current cache implementation will cache a gRPC's services based on ip + port.
So if a stub is loaded and executed against gRPC server the cache gets populated, for next request the gRPC will check that this ip + port is in cache. However, the correct stub will not be in cache since only one proto file has been loaded.