Don't use 5353 source port for mDNS queries

RFC 6762 section 5.1 says that one-shot Multicast DNS queries MUST NOT
be sent using UDP source port 5353, since using UDP source port 5353
signals the presence of a fully compliant Multicast DNS querier.

DNS resolver works as a one-shot Multicast DNS querier, which send
queries from random port and does not fully implement Multicast DNS
features. The 5353 source port should be excluded from random port
selection.

Bug: 227147672
Test: atest
Change-Id: I05d426c179182d3f08b037cb1bab3a43ea501063