nlsr: Add support for sources to NamePrefixList

Added support for string sources to NamePrefixList entries.  Required was
some tweaking of the API, and refactoring usage around the codebase.

Change-Id: I44813e024a88dc1f591f427b0fad568a7d5353ab
refs: #4177
diff --git a/src/publisher/lsa-publisher.cpp b/src/publisher/lsa-publisher.cpp
index a46ef60..6bfc1dc 100644
--- a/src/publisher/lsa-publisher.cpp
+++ b/src/publisher/lsa-publisher.cpp
@@ -124,7 +124,7 @@
     std::shared_ptr<tlv::LsaInfo> tlvLsaInfo = tlv::makeLsaInfo(lsa);
     tlvLsa.setLsaInfo(*tlvLsaInfo);
 
-    for (const ndn::Name& name : lsa.getNpl().getNameList()) {
+    for (const ndn::Name& name : lsa.getNpl().getNames()) {
       tlvLsa.addName(name);
     }