[Driver] More robust way of finding subcommand path
[Driver] More robust way of finding subcommand path

roambotics/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,glessard/swift,roambotics/swift,roambotics/swift,apple/swift,benlangmuir/swift,benlangmuir/swift,roambotics/swift,apple/swift,glessard/swift,glessard/swift,apple/swift,glessard/swift,apple/swift,glessard/swift,glessard/swift,benlangmuir/swift,apple/swift,apple/swift,benlangmuir/swift