Unbound: Group patch work for example.conf.in

Unbound: Group patch work for example.conf.in
-Remove interlaced configuration changes
--Less sensitive to upstream example.conf changes
--Easier to read patch-of-patch work for maintenance
-Use MEMORY CONTROL EXAMPLE from http://unbound.net/
--Review and rework with respect to previous pacakge
--Effectively the same configuration as previous package
-Disable DNSSEC by default due to real-time chicken-n-egg
--Many OpenWrt target devices have no power-off clock (reboot)
--User choice of work around should be conscious
--Initial install should not fail reboot with DNSSEC default
-Add some defaults explicitly to prevent surprises

Signed-off-by: Eric Luehrsen <redacted>