dnsmasq: bump to dnsmasq v2.77test3

New test release (since test1) includes 2 LEDE patches that are
upstream and may be dropped, along with many spelling fixes.

Add forthcoming 2017 root zone trust anchor to trust-anchors.conf.

Backport 2 patches that just missed test3:

Reduce logspam of those domains handled locally 'local addresses only'
Implement RFC-6842 (Client-ids in DHCP replies)

Compile & run tested Archer C7 v2

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>