a little cleanup of address stuff for linkd
a bit more cleanup of inetaddress usage
this test has probably been wrong all along, since it was added after we did the IPv6 stuff with bad null-checking in InetAddressUtils
Merge branch '1.12'

Conflicts:
	opennms-services/src/main/java/org/opennms/netmgt/linkd/AbstractQueryManager.java
	opennms-services/src/main/java/org/opennms/netmgt/linkd/DbEventWriter.java
	opennms-services/src/test/java/org/opennms/netmgt/linkd/Nms101Test.java