OBMFULL-4919 filter ResourceAttendee to disallow sending any emails to those resources
OBMFULL-4919 If no user is found when converting attendees, we also search for a possible resource instead of creating automatically a contact.

Conflicts:

	java/sync/services-module/src/main/java/fr/aliacom/obm/common/calendar/CalendarBindingImpl.java
	java/sync/services-module/src/test/java/fr/aliacom/obm/common/calendar/CalendarBindingImplTest.java
OBMFULL-4919 rework filterAttendees to not rely on ical type