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d/t/tgtbasedmpaths: reduce memory pressure avoiding OOM triggered false positives

Christian Ehrhardt requested to merge paelzer-guest/multipath-tools:avoid-OOM-on-autopkgtest into master

Due to changes in fio the memory consumption increased a lot from ~450M to ~1.1G even for our trivial workload. This was discussed in an upstream issue 1 and a mitigation was mentioned.

This change adapts the test scripts in d/t/tgtbasedmpaths to use that dropping the memory pressure by two orders of magnitude and thereby avoiding false positives 2 that formerly got triggered by OOMs due to that.

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