Unwanted output noted in previous commit was result of forgetting
that the hp4controller modules had been installed to /usr/local/...
via setuptools (setup.py in hp4-ctrl), so the modules being
accessed were not the ones I was modifying in my home directory.

To more easily modify these files and run tests, instead of
using setuptools we modify PYTHONPATH in .profile in the home
directory.  We must also modify sudoers to preserve the
environment when running commands via sudo, because the
test requires the use of sudo, because of mininet.

We should add basic instructions to this effect.

Can't figure out why getting unwanted output during tests...

Demo: HP4 running test_hub; two tests:
- h1 ping h2 (expected: success)
- h1 ping h3 (expected: fail)
Both tests return the expected results.

To run: sudo ./test.py.

Additional tests may be added with 1-3 files per need:
- <proj>.p4
- [<proj>.commands] -- bmv2 runtime table management commands
- [<proj>.py] -- test cases + mininet script

If the <proj>.py file is not present, the framework uses
test_mininet.py with the two tests described above (h1 ping h2,
h1 ping h3).

Realized we can simply pass the name of the script file to
the CLI initializer via the script= parameter

Add mininet script argument for automating mn commands

Action handling now involves checking whether
meta_primitive_state.primitive[+Y+] == 0 between primitives,
which indicates no further primitives remain, but that value
was used to indicate a modify_field primitive, so the value
for modify_field has been changed.

Requires update to compiler in hp4-ctrl repository

This folder housed old tests that have long since
been rendered obsolete by 1) changes to HyPer4;
and 2) the controller repository (hp4-ctrl:
git@gitlab.flux.utah.edu:hp4/hp4-ctrl.git).

Saved two analysis scripts that may yet be useful
in hp4/analysis.

All files were obsolete, though hp4_design.md may still
have some interest (but probably only to me).
This file was nevertheless removed
from the repo and moved to a local folder for archived
design analysis.

Files not meant for the public have been moved to a local
directory that is gitignored

Makes virtual network compositions need to use explicit
forwarding instead of copying ingress port to egress_spec, but
in the meantime, this commit better supports vdev chains, esp.
vdevs like the arp proxy.

Also, comments added to help identify conditionals, supporting
debugging via the event logger.

The next_table field was 4 bits, but init_program_state was
assigning a value of '99' corresponding to matchless table type.
When a modify_field tries to assign a value larger than the width
of the target, bmv2 silently fails.

Over in hp4-ctrl, t06 now works in its most essential test -
a chain is created with simple_router -> firewall, and the
router routes, and the firewall blocks/doesn't block correctly!

Conflicts:
	hp4/hp4commands.txt
	hp4/p4src/includes/parser.p4
	hp4/p4src/includes/setup.p4
	hp4/template/includes/parser.p4t
	hp4/template/includes/setup.p4t

p4c-hp4 belongs to the hp4-ctrl repo.  Script for nano_msg client updated.
Misc files deleted.

Now, packets drop when we tell them to.

Thought avoiding resubmits would be key to significant
increase in throughput, but this commit casts doubt
on the idea that resubmits are the main contributor
to the throughput penalty.  The next obvious thing
is the number of actions that have dependencies
among their primitives, which would induce stalls
in the pipeline.

This reverts commit b729fcc0.

Turns out that made performance worse, significantly.

Minimum Ethernet frame is 64 B for good reason - regardless of
link layer protocol, I doubt we'll ever see a packet smaller
than 64 B.  This change should avoid most of the resubmits
previously incurred by HyPer4's programmable parser.

run.sh works the same way in the p4-projects repo; it invokes
run_demo.sh after setting a path variable.  Use run.sh instead
of run_demo.sh from now on.

A better word for 'extracted' would be 'parsed representation',
but alas

The previous commit overlooked a few things...