rename requesterState to RequestContext

Change-Id: I747559b4da11b350b01494c7c54a674c3d3d45f9
diff --git a/src/requester-state.cpp b/src/requester-state.cpp
index 0c4755d..3e14de5 100644
--- a/src/requester-state.cpp
+++ b/src/requester-state.cpp
@@ -24,7 +24,7 @@
 namespace ndncert {
 namespace requester {
 
-RequesterState::RequesterState(security::KeyChain& keyChain, const CaProfile& caItem, RequestType requestType)
+RequestContext::RequestContext(security::KeyChain& keyChain, const CaProfile& caItem, RequestType requestType)
   : m_caItem(caItem)
   , m_keyChain(keyChain)
   , m_type(requestType)