Build

[platform] implement platform dnssd apis (#2664) #7173

Job	Run time
package	4m 17s
check (Debug, mDNSResponder)	24m 14s
check (Debug, avahi)	20m 20s
pretty	39s
check (Release, mDNSResponder)	24m 19s
check (Release, avahi)	20m 6s
rest-check (rest-off)	23m 47s
scan-build	1m 29s
rest-check	24m 4s
script-check	4m 16s
simulation	7m 3s
	2h 34m 34s

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