message: added RemovePeer to MockCommandExecutor
diff: @@ -69,6 +69,11 @@ namespace iroha {
  return doGrantPermission(command);
  }
  + CommandResult operator()(
  + const shared_model::interface::RemovePeer &command) override {
  + return doRemovePeer(command);
  + }
  +
  CommandResult operator()(
  const shared_model::interface::RemoveSignatory &command) override {
  return doRemoveSignatory(command);
  @@ -135,6 +140,9 @@ namespace iroha {
  doGrantPermission,
  CommandResult(const shared_model::interface::GrantPermission &));
  + MOCK_METHOD1(doRemovePeer,
  + CommandResult(const shared_model::interface::RemovePeer &));
  +
  MOCK_METHOD1(
  doRemoveSignatory,
  CommandResult(const shared_model::interface::RemoveSignatory &));
  