Add skip-not-installable restriction

Paul Geversrequested to merge
elbrus/autopkgtest:bts-905317-flaky-and-unsatisfiable-depends into master

A test might have test dependencies that can't be fulfilled on all architectures. Therefore, when apt-get installs the dependencies, it will fail. Don't treat this as a test failure, but instead treat it as if the test was skipped.

Closes: #905311

Edited by Paul Gevers

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