bluetooth: fix bug IOTOS-1507 to let case quit if no BT device
bluetooth: fix bug IOTOS-1507 to let case quit if no BT device

In init function, check return value of the hci0 operation. If test
device has no BT, it will quickly return error.

Signed-off-by: Zhang Jingke <0979c04a6d09a3b3c8dd699e3664fb112fdd2a5b@intel.com>

daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,ostroproject/meta-iotqa,ostroproject/meta-iotqa,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa