Fixing the Add/Delete Contact bug, now when a contact is added and removed, the panelPolicyManager will add/remove the contact into/from trust anchors

Change-Id: Ia7a8bc5c6cbe1744018410c0ca0019db3e5d3994
diff --git a/src/panel-policy-manager.cpp b/src/panel-policy-manager.cpp
index ecb03b1..96900e7 100644
--- a/src/panel-policy-manager.cpp
+++ b/src/panel-policy-manager.cpp
@@ -180,6 +180,12 @@
   m_trustAnchors.insert(pair <Name, Publickey > (selfEndorseCertificate.getPublicKeyName(), selfEndorseCertificate.getPublicKeyInfo())); 
 }
 
+void
+PanelPolicyManager::removeTrustAnchor(const Name& keyName)
+{  
+  m_trustAnchors.erase(keyName); 
+}
+
 Ptr<Publickey>
 PanelPolicyManager::getTrustedKey(const ndn::Name& inviterCertName)
 {