mantle: Rework testiso/metal to use new qemu channel API #1307
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First, add an API for creating channels that give a pipe
to the Go side, so we don't need to write to temp files that
we then read.
Now, I'm still trying to fine-tune the interface between the
"metal" API and the more hardcoded "testiso".
Tweak things so that the install path supports being provided
a builder object, but add an API that creates a default one
that mostly just sets up the default max memory.
(Also, I stopped trying to special case a lower memory for
the legacy install because that's going to go away anyways)