Extensive debug removed, all discoveries work ok now

	modified:   core/src/main/java/com/google/bitcoin/core/Peer.java
	modified:   core/src/main/java/com/google/bitcoin/net/discovery/DnsDiscovery.java
	modified:   core/src/main/java/com/google/bitcoin/net/discovery/IrcDiscovery.java
	modified:   core/src/main/java/com/google/bitcoin/net/discovery/PeerDBDiscovery.java