Fixes:	#2773

The fact that the previous object was IMS/INM eligable does not make
one created from it eligable as well.

Also test for the miss + hfm case with IMS/INM

Fixes #2763

it really is about time we rename OC_F_PASS -> OC_F_HFM, but
my recent cleanup attempt included too much change before the release

constraints.

Related to: #2763

Fixes #2761

The only way H2_Send_Frame can fail is if the TCP connection is
dead, so reach out and set the session errored and be done with it,
rather than pass an inconvenient error status down through the callers.

While here use writev(2) instead of two write(2) calls.

Most of the heavy lifting by:	slink

Fixes: #2760, #2754, #2654

require new bytes to be received.

Refs 9804794a

Partial fix for #2654 and #2754

The syntax is

	expect <skip> <vxid> <tag> <regex>

Also remove some bogus .*$ from regexen (waving to @slimhazard)

return(pass) from vcl_recv does not take a duration argument

Fix vmodtool with python3

Without this patch, it did
TypeError: Unicode-objects must be encoded before hashing

Fixes: #2436

I belive this makes our builds reproducible.

Fixes:	#2436

Fixes: #2753