Commits on Feb 26, 2021

1. Fix nasa#1020, refactor SB buffer descriptor …

   Combine the "zero copy" and the normal CFE buffer descriptor into a single
   unified CFE_SB_BufferD_t object.  This cleans up a bunch of extra logic
   related to zero-copy buffers, including the extra descriptor object.  The
   result is a simpler zero-copy design that is much less different from the
   standard (non-zero-copy) message path.
   
   All message descriptor objects are now tracked in a list by SB, not just
   the zero-copy descriptors (for consistency - if any buffers need to be
   tracked, they should all be tracked).

   

   jphickey committed Feb 26, 2021
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