WIP: LP 1760810 use aspcud solver

Paul Geversrequested to merge
elbrus/autopkgtest:lp-1760810-use-aspduc-solver into master

DON'T MERGE YET: maybe breaks schroots.

I implemented the use of the aspcud solver as I announced in https://lists.debian.org/debian-release/2018/05/msg00275.html.

I couldn't get the SchrootRunner test to run, there was always some broken pipe, but running the same tests in an LXC worked. I am very unsure if this means that Schroot support is broken or that the testing framework is broken in this case. Any ideas of what is going on and/or how to fix this are appreciated.

Edited by Paul Gevers

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