Clears all credentials.
Get the {@link Credentials credentials} for the given authentication scope.paramauthscope the {@link AuthScope authentication scope}returnthe credentialssee#setCredentials(AuthScope, Credentials)
Sets the {@link Credentials credentials} for the given authentication scope. Any previous credentials for the given scope will be overwritten.paramauthscope the {@link AuthScope authentication scope}paramcredentials the authentication {@link Credentials credentials} for the given scope.see#getCredentials(AuthScope)