lib: Abstract parsing of distribute lists

Abstract the parsing of distribute lists so that we
don't have as much cut-n-paste code.

This is a setup commit for future work.  In effect
current distribute-list handling is all kinds of messed up

a) eigrp and babel both attempt to use distribute-lists, they just plain
don't work.
b) `distribute-list` is only sent to rip.  `ipv6 distribute-list`
is sent to ripngd.  If you use `distribute-list` under `router ripng`
it sends the command to rip but ripd is in the wrong mode and it
never works.
c) Should ripngd care about v4 and v6 specific distribute-lists?
This dichotomy was added for babel but babel has been broke
about this since day 1( see a ).

All in all we need to unwind this whole mess.  Make distribute-list
commands specific to the daemons( so that we can be in the right
sub-mode ).  But the parsing is going to be the same across all
daemons.  So let's provide that functionality in `lib/distribute.c`

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

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