exceptions: Make Tlv::Error a base class for all packet-processing exceptions

This commit also includes a number of code style fixes.

Change-Id: I44f83915e733b43d5f43b4266902c8262e928d91
Refs: #1528
diff --git a/src/management/nfd-control-response.hpp b/src/management/nfd-control-response.hpp
index a4a5ae3..3c2a06d 100644
--- a/src/management/nfd-control-response.hpp
+++ b/src/management/nfd-control-response.hpp
@@ -18,7 +18,8 @@
  *
  * @see http://redmine.named-data.net/projects/nfd/wiki/ControlCommand
  */
-class ControlResponse {
+class ControlResponse
+{
 public:
   class Error : public Tlv::Error
   {