Relax the "discover scan" check for bringing NCP interface up
Relax the "discover scan" check for bringing NCP interface up

This commit relaxes the NCP state check in `TaskScan` (when performing
a discover scan) to allow discover scan to be performed in any offline
state (in particular "offline:commissioned").

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