mgmt: Reinitialize multicast faces and partially reload config file on HUP signal

The following elements from the config file are reloaded:
- effective user/group
- log levels
- multicast faces (enable/disable)
- security

Change-Id: I6ddf124702b30610dd0404d8fbaa9a9d800f02bf
Refs: #1584
diff --git a/daemon/face/ethernet-factory.cpp b/daemon/face/ethernet-factory.cpp
index 0408f03..a399a64 100644
--- a/daemon/face/ethernet-factory.cpp
+++ b/daemon/face/ethernet-factory.cpp
@@ -69,7 +69,8 @@
 EthernetFactory::findMulticastFace(const std::string& interfaceName,
                                    const ethernet::Address& address) const
 {
-  MulticastFacesMap::const_iterator i = m_multicastFaces.find(std::make_pair(interfaceName, address));
+  MulticastFaceMap::const_iterator i =
+    m_multicastFaces.find(std::make_pair(interfaceName, address));
   if (i != m_multicastFaces.end())
     return i->second;
   else