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-forwarding-entry.hpp b/src/management/ndnd-forwarding-entry.hpp
index a084964..e654ff4 100644
--- a/src/management/ndnd-forwarding-entry.hpp
+++ b/src/management/ndnd-forwarding-entry.hpp
@@ -19,7 +19,8 @@
 /**
  * An ForwardingEntry holds an action and  Name prefix and other fields for an forwarding entry.
  */
-class ForwardingEntry {
+class ForwardingEntry
+{
 public:
   ForwardingEntry(const std::string& action,
                   const Name& prefix,