Pass MDNS packet if QDCOUNT != 1

The current MDNS filter will only able to match the first QNAME in the
packet. The MDNS filter should fail open if packet doesn't contains any
QNAME or contains more than one QNAME.

Bug: 291028703
Test: atest NetworkStackTests
Change-Id: I4648472ed83f14a3f2fc7630ff5cc752c0985614
2 files changed