void
rrToWire(DNSOutput out, Compression c, boolean canonical) {
	out.writeU16(u16Field);
	nameField.toWire(out, null, canonical);
}
Implements common functionality for the many record types whose format
is an unsigned 16 bit integer followed by a name.

@author Brian Wellington
src/main/java/core/org/xbill/DNS/U16NameBase.java