Broker::NetworkInfo$address is of type string. The Broker::peers() BiF treated
it as an address, which caused ZVal's type validation to flag a
mismatch and abort.
Includes a small tweak to the broker.unpeer test that makes it invoke
Broker::peers(), which breaks in absence of the fix.
This also installs symlinks from "zeek" and "bro-config" to a wrapper
script that prints a deprecation warning.
The btests pass, but this is still WIP. broctl renaming is still
missing.
#239
