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-face-instance.hpp b/src/management/ndnd-face-instance.hpp
index 530f10d..24f90f9 100644
--- a/src/management/ndnd-face-instance.hpp
+++ b/src/management/ndnd-face-instance.hpp
@@ -17,7 +17,8 @@
 /**
  * An FaceInstance holds an action and  Name prefix and other fields for an forwarding entry.
  */
-class FaceInstance {
+class FaceInstance
+{
 public:
   FaceInstance(const std::string& action,
                int64_t     faceId,