fs-ble: added connman service script for bluetooth

There is an unfixed race condition when powering bluetooth

Sometimes the service script is executed before connman discovers
the BLE dongle, causing the device is not powered.

Troubleshooting:
IF "hcitool dev" reports nothing, try the following:
 1. type: systemctl stop connman-config
 2. type: systemctl start connman-config
 3. type: hcitool dev to see the dongle
 4. use "hcitool lescan" and "gatttool" to verify discovery and
    connection

Signed-off-by: Torsten Lund <lund.torsten@gmail.com>