[IOT-771] Reintroduce missing Linux BLE adapter code.

[IOT-771] Reintroduce missing Linux BLE adapter code.

The IoTivity BLE Linux transport doesn't send data due to missing
code, e.g. stub implementations for several functions required by the
CA LE interface. A incorrect revision was merged during the code
review, likely because the gerrit draft revision with the correct
implementation was not published, and ultimately lost. This patch
reintroduces implementations for those functions.

Change-Id: If9e9f7ebaeebb9072cd7762e94a82ef45809f95b
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3011
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>