Support multiple query packets

If the query with known answer feature is enabled and the
MdnsPacket is too large for a single DatagramPacket, it
will be split into multiple DatagramPackets.

Bug: 312657709
Test: atest FrameworksNetTests NsdManagerTest
Change-Id: I831fb6035cc0ad03078fbd3b9c550b56ddca07fb
8 files changed