Add a basic add-path regression test

Implement basic test for RFC8950

Add a maxattr regress test that causes the rdomain1 bgpd instance to trip
over 4096 bytes for a BGP UPDATE message. Check on the 3rd system that the
affected prefixes are properly withdrawn.

Add a capability enforcement integration test.

This should ensure that no / yes and enforce work the way we want.

Add regress test to verify that IPv6 link-local addresses work

Add a fairly minimal ixp setup generated by arouteserver
This does a lot of community manipulation and also tests a few other
bits of code (prepends, roa, prefix-set).

Add regress test to check for bad attribute lenght for optional transitive
attributes.

Enable l3vpn test

Add an abolute minimal test for L3VPNs. Right now not linked since there
is a bug in the kroute code preventing the VPN route to be added properly.

Add a intergration test that checks if the pftable feature works.

Make CLEANFILES patterns not match anything that may live outside of obj.
Running make clean without obj should not remove any non-temp files
like *.conf.

Regress test for the open policy role capability. Make sure it properly
fails when enforced or there is a missmatch and that the session is accepeted
if the roles match.

Introduce a integration test for max-communities

Add a basic regress test to test the 'rde evaluate all' feature.

Add med test, this no longer fails in -current

Totally rework the exabgp integration tests. Instead of a simple shell
script to talk to exabgp api use a small c programm. Use a fifo to
send commands to this program. While exabgp includes a cli to

Totally rework the exabgp integration tests. Instead of a simple shell
script to talk to exabgp api use a small c programm. Use a fifo to
send commands to this program. While exabgp includes a cli tool exactly
for that it is impossible to use.
Use a single config file for multiple sessions and make sure exabgp is
properly killed on exit (pkill exabgp fails since it is a python script).
Introduce a med target to test the route decision process handling med
path. This test currently fails and is not hooked up yet.

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Also test maxprefix out. Based on maxprefix test added a few days ago.

Add a simple regress test to check that max-prefix works

Move comment about exabgp to the rule since this way it is shown to the user.
Reminded by bluhm@

The as0 regress can be enabled now. Needs exabgp to run else it is skipped.

Implement RFC7607 testing using exabgp since we need to fiddle with
attributes. Currently not enabled since it will fail.

Cleanup the scripts a bit, error out early if not run as root, use
set -x later in the script instead of ksh -x to shorten the output
of the tests.

Add a basic test to check that mrt table dumps work.
Hint: they don't right now

Add route origin validation test

Add a test that catches problems of tcp md5 signatures, like the one
fixed in bgpd/pfkey.c rev 1.54 by claudio.