mgmt+core: Moving SegmentPublisher to core/ and removing KeyChain from nfd::AppFace

This change ensures interface uniformity between nfd::AppFace and
ndn::Face and allow now templated version of SegmentPublisher to be used
with either.

Change-Id: I82e29528b13b37bd2ae27ef47db30e8c87c15a38
Refs: #1749
diff --git a/daemon/mgmt/strategy-choice-publisher.cpp b/daemon/mgmt/strategy-choice-publisher.cpp
index add1b73..163ac3a 100644
--- a/daemon/mgmt/strategy-choice-publisher.cpp
+++ b/daemon/mgmt/strategy-choice-publisher.cpp
@@ -35,9 +35,10 @@
 
 
 StrategyChoicePublisher::StrategyChoicePublisher(const StrategyChoice& strategyChoice,
-                                                 shared_ptr<AppFace> face,
-                                                 const Name& prefix)
-  : SegmentPublisher(face, prefix)
+                                                 AppFace& face,
+                                                 const Name& prefix,
+                                                 ndn::KeyChain& keyChain)
+  : SegmentPublisher(face, prefix, keyChain)
   , m_strategyChoice(strategyChoice)
 {