Merge branch '82-cacheclean-test-is-not-robust' into 'master'

Resolve "cacheclean test is not robust."

Closes #82

See merge request !50
8 jobs for master in 84 minutes and 22 seconds (queued for 7 seconds)
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failed build:debian:jessie:amd64 #1556
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passed build:debian:sid:i386 #1561
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failed build:debian:stretch:amd64 #1558
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passed build:ubuntu:trusty:amd64 #1562
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passed build:ubuntu:xenial:i386 #1563
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build:debian:jessie:amd64 Build
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