Merge tag '1.5.3' into 1.6

(no changes)

Conflicts:
	assemble/pom.xml
	core/pom.xml
	examples/pom.xml
	examples/simple/pom.xml
	fate/pom.xml
	minicluster/pom.xml
	pom.xml
	proxy/pom.xml
	server/tserver/pom.xml
	start/pom.xml
	test/pom.xml
	trace/pom.xml