set INADDR_ANY/IN6ADDR_ANY_INIT address string to m_socket

when CUDPSocket::open() is called with m_address (in CUDPSocket) is nothing,
IPv4 socket is created by "0.0.0.0" (INADDR_ANY) address.

This causes a problem that DMRGateway cannot connect to reflector on IPv6.
To choose default INADDR_ANY/IN6ADDR_ANY_INIT address, added
open(address_family) in UDPSocket.cpp.

Following code sets address string at construction, not modified.
	NXDNNetwork.cpp
	POCSAGNetwork.cpp
	YSFNetwork.cpp

Other codes does not set, modified open() -> open(address_family)
	DMRNetwork.cpp
	DStarNetwork.cpp
	MMDVMHost.cpp
	MobileGPS.cpp
	P25Network.cpp
	RemoteCommand.cpp
	RemoteControl.cpp

I think there is more clever method, but I have no other idea.

Maybe IPv6 support for digital radio works, but RemoteControl can work
IPv4 only.

RemoteControl.cpp

@@ -43,7 +43,7 @@ CRemoteControl::~CRemoteControl()
 
 bool CRemoteControl::open()
 {
-	return m_socket.open();
+	return m_socket.open(AF_INET);	/* XXX IPv4 only */
 }
 
 REMOTE_COMMAND CRemoteControl::getCommand()