Add rk_undumptext(), which NUL-terminates the contents it reads.
rk_undumptext(), and now also rk_undumpdata(), can read from regular and
non-regular files (e.g., ttys, pipes, devices, but -on Windows- not
sockets).
This means that `asn1_print` can now read from `/dev/stdin`, which can
be a pipe.
There's a way to set a limit on how much to read from non-regular files,
and that limit defaults to 10MB.
At any rate, the rk_dumpdata(), rk_undumpdata(), and rk_undumptext() functions
really do not belong in lib/roken but in lib/base. There are other utility
functions in lib/roken that don't belong there too. A rationalization of the
split between lib/roken and lib/base is overdue. And while we're at it -lest I
forget- it'd be nice to move all the krb5_storage functions out of lib/krb5 and
into lib/base, as those could come in handy for, e.g., implementing OpenSSH
style certificates and other things outside the krb5 universe.
8b6926f4c0