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/ndnd-status-response.hpp b/src/management/ndnd-status-response.hpp
index 23597b9..2229a1d 100644
--- a/src/management/ndnd-status-response.hpp
+++ b/src/management/ndnd-status-response.hpp
@@ -13,7 +13,8 @@
 namespace ndn {
 namespace ndnd {
 
-class StatusResponse {
+class StatusResponse
+{
 public:
   StatusResponse()
     : code_(0)