meta-info: deprecate MetaInfo::TYPE_* constants

The following items are deprecated:

* tlv::ContentType_Default
* MetaInfo::TYPE_DEFAULT
* MetaInfo::TYPE_BLOB
* MetaInfo::TYPE_LINK
* MetaInfo::TYPE_KEY
* MetaInfo::TYPE_NACK

refs #2128

Change-Id: I01f0aa0dd27d32a18a9fff79401b5784d9ddcb10
diff --git a/src/meta-info.cpp b/src/meta-info.cpp
index 3db4cb3..a4f9938 100644
--- a/src/meta-info.cpp
+++ b/src/meta-info.cpp
@@ -33,7 +33,7 @@
               "MetaInfo::Error must inherit from tlv::Error");
 
 MetaInfo::MetaInfo()
-  : m_type(TYPE_DEFAULT)
+  : m_type(tlv::ContentType_Blob)
   , m_freshnessPeriod(-1)
 {
 }
@@ -154,7 +154,7 @@
     }
 
   // ContentType
-  if (m_type != TYPE_DEFAULT)
+  if (m_type != tlv::ContentType_Blob)
     {
       totalLength += prependNonNegativeIntegerBlock(blk, tlv::ContentType, m_type);
     }
@@ -207,7 +207,7 @@
     ++val;
   }
   else {
-    m_type = TYPE_DEFAULT;
+    m_type = tlv::ContentType_Blob;
   }
 
   // FreshnessPeriod