Improved RpslObject.getValuesForAttribute()
Added override support for person+role name change

Also went through the rest of the code and replaced update.isOverride(), which only checks if override credential was supplied, with getSubject().hasPrincipal().
added end2endtest category, updated pom.xml to rely on that
fix typo
Fixed pingable validation.
Merge branch 'master' into rdap

Conflicts:
	whois-endtoend/src/test/java/net/ripe/db/whois/api/rest/WhoisRestServiceEndToEndTest.java