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...

Revise/improve support for arp proxy scenario; remove assumption
that commands.txt file exists and should be fed to P4 switch by
default

This commit corresponds to a commit in the p4-projects repo

P4-projects repo is where 'native' functions are housed and tested;
now hp4 sims are kicked off the same way, and topo.py and
run_demo.sh and run.sh are identical (env.sh can be different
to accomodate different paths for each setting)

This commit brings the repo up to date but is not meant to convey
pursuit of full INT demo at this time.

Having the match field simplifies controller tasks related to
composition management.  It has to do with handles associated
with table entries.  Without the vdev_ID match field, essentially
we have a tough time coordinating between vdevs that employ
the drop primitive in the same stage/action (esp: two vdevs
created from the same .p4).

Also in this commit: hp4commands adds the startup rules that are
required for proper functioning but independent of any vdev.