introduce two functions, map_x_s() and map_s_x(), to map

between integers and strings using a single translation table,
and use them in a few places instead of ad-hoc routines
that duplicate the table.

On passing, note that REFER_CONFIRMED is never used, and add a
few comments.

Nothing to backport here.



git-svn-id: http://svn.digium.com/svn/asterisk/trunk@76547 f38db490-d61c-443f-a65b-d21fe96a405b

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