Add spi-hdlc-adapater socket example in wpantund.conf sample
Add spi-hdlc-adapater socket example in wpantund.conf sample

abtink/wpantund,openthread/wpantund,abtink/wpantund,openthread/wpantund,openthread/wpantund,abtink/wpantund,abtink/wpantund,openthread/wpantund