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We were using a different array of function pointers to represent each
minor version.  This makes adding a new minor version tedious, since it
needs a step to copy, paste and modify a new version of the same
functions.

This patch combines the v4 and v4.1 arrays into a single instance and
will check minor version support inside each decoder function.
Signed-off-by: Anna Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>