wireless/bluetooth:  This completes the basic logic path that gets frames from the Bluetooth stack and into the network layer.
    wireless/bluetooth:  Fleshes out some of the network packet receive logic.
    wireless/bluetooth:  Replace buffer allocated with primitive allocator from ieee 802.15.4.
    wireless/ieee802154:  Fix a few typos.
    wireless/bluetooth:  More renaming in preparation for some real work.
    wireless/bluetooth:  Some trivial renaming; update comments

This comment adds (1) basic support for AF_BLUETOOTH sockets.  The logic compiles but is still incomplete.  Support for Bluetooth is general is still dependent on CONFIG_EXPERMIMENTAL because it is not yet ready for used.

Squashed commit of the following:

    wireless/bluetooth:  Some small changes that gets to a clean compile by just eliminating some incorrect implementations (still with a lot of warnings.  The logic is still incomplete but now not so lethal.
    wireless/bluetooth:  Restructuring:  Connection interfaces should internal to wireless/bluetooth.  include/nuttx/wireless/bt_conn.h removed and merged with wireless/bluetooth/bt_conn.h.  Several fix to get closer to bt_netdev.c compiling.  Need to design some not interfaces and use some existing interfaces to send and receiv packets.
    wireless/bluetooth: Some organization with some network device compile errors fixed.  Still not even close to compiling.
    net/bluetooth:  Fix numerous compile issues; Still open design issues with regard to the interface with the Bluetooth stack.
    wireless/bluetooth:  Create bt_netdev.c with a crude copy of mac802154_netdev.c.  Does not not even compile yet.
    include/nuttx/net:  Add bluetooth.h.  Content is not yet correct.
    net/netpackets:  Add bluetooth.h.  Update net/bluetooth to use new socket address definition.
    net/bluetooth:  Some fixes for initial build.
    net/bluetooth:  Add initial support for Bluetooth sockets.  The initial cut is just the a clone of the IEEE 802.15.4 socket support with name changes.
    net/ieee802154:  Fix some typos noted when cloning to create net/bluetooth.

wireless/bluetooth: Add driver object in all driver methods so that the driver has a way of maintaingin context.

This commit brings in the Bluetooth stack from the Intel/Zephyr arduino101_firmware_source-v1.tar package.

NOTE: This selection is marked EXPERIMENTAL.  It is incomplete and, hence, untested.  It still lacks any low-level Bluetooth drivers and is missing the network interface driver.

Squashed commit of the following:

    wireless/bluetooth:  Fixe last of compile issues.  Now compiles without errors or warnings.
    wireless/blutooth:  Add macros BT_GETUINT16() and BT_PUTUINT16().  Fix more compile errors.  Only one file now generates compile errors.
    wireless/bluetooth:  Add macros BT_LE162HOST() and BT_HOST2LE16().
    wireless/bluetooth:  Add bt_queue.c; begin fixing comple errors.  Many more compile problems yet to resolve.
    Kconfig edited online with Bitbucket
    wireless/bluetooth:  Struggling to remove nano_fifo logic:  Replace buffer management with IOB allocate... this changes some logic and might have some side effects.  Use messages queues instead of nano-fifos to inter-task communications.  nano-fifos still used in 'frag' logic... whatever that is.
    wireless/bluetooth:  Fix numerous typos introduced by an ill conceived search-and-replace.
    wireless/bluetooth:  Add message queue support to manage interthread buffer transfers.
    wireless/bluetooth:  Replace fibers with kernel threads.
    wireless/bluetooth:  Fix a few initial compile errors.  Just the tip of the iceberg.
    wireless/bluetooth:  Complete leveage of the bluetooth stack including public header files.
    wireless/bluetooth:  Complete leverage of all Bluetooth source files.  Still missing header files that defines the driver interface.  Also missing the network driver implementation.
    wireless/bluetooth:  Fix some naming of static global variables.
    wireless/bluetooth:  Adds three more files ported from the Intel/Zephyr arduino101_firmware_source-v1.tar package (plus two original files).
    wireless/bluetooth:  Adds five more files ported from the Intel/Zephyr arduino101_firmware_source-v1.tar package.
    wireless/bluetooth:  Adds three more files ported from the Intel/Zephyr arduino101_firmware_source-v1.tar package.
    wireless/bluetooth:  First few files ported from the Intel/Zephyr arduino101_firmware_source-v1.tar package.