Remove outdated instance/machine-id warning
Remove outdated instance/machine-id warning

titan09's unique-instance-id/machine-id generator includes the value
of static AtomicLong on the GraphDatabaseConfiguration class.  This is
incremented each time an instance automatically generates its
unique-instance-id.  Because of this AtomicLong counter, it's no
longer necessary to manually specify unique-instance-id/machine-id
when running multiple Titan instances from the same process, so long
as all of those instances use the same GraphDatabaseConfiguration
class.

However, in unusual classloader configurations, or in any case where
multiple instances of the GraphDatabaseConfiguration class are loaded
simultaneously within a single JVM, manually setting
unique-instance-id is still required.

thinkaurelius/titan,elubow/titan,amcp/titan,elubow/titan,thinkaurelius/titan,dylanht/titan,samanalysis/titan,amcp/titan,elubow/titan,CYPP/titan,amcp/titan,englishtown/titan,CYPP/titan,graben1437/titan,pluradj/titan,mbrukman/titan,mbrukman/titan,mbrukman/titan,CYPP/titan,dylanht/titan,thinkaurelius/titan,samanalysis/titan,mbrukman/titan,thinkaurelius/titan,samanalysis/titan,dylanht/titan,banjiewen/titan,mbrukman/titan,graben1437/titan,pluradj/titan,banjiewen/titan,dylanht/titan,amcp/titan,CYPP/titan,pluradj/titan,englishtown/titan,englishtown/titan,samanalysis/titan,englishtown/titan,pluradj/titan,banjiewen/titan,elubow/titan,graben1437/titan,graben1437/titan,banjiewen/titan