Merge pull request #3079 from NaterGator/linkthreadfix

src/Vehicle/Vehicle.cc

src/comm/BluetoothLink.cc

src/comm/BluetoothLink.h

src/comm/LinkInterface.h

src/comm/LinkManager.cc

src/comm/LogReplayLink.cc

src/comm/LogReplayLink.h

src/comm/MAVLinkProtocol.cc

src/comm/MockLink.cc

src/comm/MockLink.h

src/comm/QGCFlightGearLink.cc

src/comm/QGCFlightGearLink.h

src/comm/QGCHilLink.h

src/comm/QGCJSBSimLink.cc

src/comm/QGCJSBSimLink.h

src/comm/QGCXPlaneLink.cc

src/comm/QGCXPlaneLink.h

src/comm/SerialLink.cc

src/comm/SerialLink.h

src/comm/TCPLink.cc