Equal returns if both URLs have the same hostname, port and scheme or not.

NormalizeKeyserverURI is normalizing a URI string by converting protocol scheme hkp:// and hkps:// to their corresponding http:// and https:// protocol scheme and returns the parsed URI with the corresponding scheme.

SameKeyserver returns if two URIs point to the same keyserver or not, URI are also normalized meaning by example that hkp://localhost is equivalent to http://localhost:11371.

SameURI returns if two URIs point to the same service or not.