dccp: Debugging functions for feature negotiation

Since all feature-negotiation processing now takes place in feat.c, functions
for producing verbose debugging output are concentrated there.

New functions to print out values, entry records, and options are provided,
and also a macro is defined to not always have the function name in the
output line.

Thanks a lot to Wei Yongjun and Giuseppe Galeota for help with errors in an
earlier revision of this patch.

Signed-off-by: Gerrit Renker <[email protected]>
Acked-by: Ian McDonald <[email protected]>

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