src: add datatype->describe()

As an alternative to print the datatype values when no symbol table is
available. Use it to print protocols available via getprotobynumber()
which actually refers to /etc/protocols.

Not very efficient, getprotobynumber() causes a series of open()/close()
calls on /etc/protocols, but this is called from a non-critical path.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1503
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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