[Merge] ~ddstreet/ubuntu/+source/systemd:root-unittests-remove-corrupt-journal-files into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-hirsute

[Dan Streetman]

This appears to fix the test-journal-flush failure, which seems to be due to local test instance journal file corruption, e.g. as seen here:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal-ddstreet-systemd/focal/arm64/s/systemd/20210106_172543_87c8d@/log.gz


autopkgtest [15:02:23]: test root-unittests: [-----------------------
...
Verifying local journal file /var/log/journal/9ea4febbada14f608c72d6769d127354/system at 0005b83c974c0f81-7436f288bfcc31f0.journal~
56dff0: Invalid object
File corruption detected at /var/log/journal/9ea4febbada14f608c72d6769d127354/system at 0005b83c974c0f81-7436f288bfcc31f0.journal~:56dff0 (of 8388608 bytes, 67%).
FAIL: /var/log/journal/9ea4febbada14f608c72d6769d127354/system at 0005b83c974c0f81-7436f288bfcc31f0.journal~ (Bad message)
Verification failed, removing corrupt file /var/log/journal/9ea4febbada14f608c72d6769d127354/system at 0005b83c974c0f81-7436f288bfcc31f0.journal~
removed '/var/log/journal/9ea4febbada14f608c72d6769d127354/system at 0005b83c974c0f81-7436f288bfcc31f0.journal~'
...
PASS: test-journal-flush
...


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https://code.launchpad.net/~ddstreet/ubuntu/+source/systemd/+git/systemd/+merge/395861
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