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It turns out OverlayFS doesn't handle gracefully when the same source is
specified multiple times in lowerdir= and it fails with ELOOP:
Failed to mount overlay (type overlay) on /run/systemd/mount-rootfs/opt (MS_RDONLY "lowerdir=/run/systemd/unit-extensions/1/opt:/run/systemd/unit-extensions/0/opt:/run/systemd/mount-rootfs/opt"): Too many levels of symbolic links
This happens even if we mount each image in a different internal mount
path, as OverlayFS will resolve it and look for the backing device, which
will be the same device mapper entity, and return a hard error.
This error does not appear if dm-verity is not used, so it is very
confusing for users, and unnecessary.
When mounting ExtensionImages, check if an image is dm-veritied,
and drop duplicates if the root hashes match, to avoid this user-unfriendly
hard error.
"journalctl -u foo.service" may not work as expected, especially entries
for _TRANSPORT=stdout, for short-living services or when the service manager
generates debugging logs. Instead, SYSLOG_IDENTIFIER= should be reliable for
stdout. Let's use it.
An example case:
```
__CURSOR=s=06278e3bf011458e973c81d370a8f7a5;i=1e4dc;b=1b0258a5c78341609bf462c72d4541c3;m=308de65;t=6194c3895a13f;x=50c7e9af5b8cfc37
__REALTIME_TIMESTAMP=1716665017803071
__MONOTONIC_TIMESTAMP=50912869
_BOOT_ID=1b0258a5c78341609bf462c72d4541c3
SYSLOG_FACILITY=3
_UID=0
_GID=0
_MACHINE_ID=d3490e076ab24968bfa19a6aab26beb3
_HOSTNAME=H
_RUNTIME_SCOPE=system
_TRANSPORT=stdout
PRIORITY=6
_PID=2668
_STREAM_ID=3f9b8855636041988d003a9c63379b8a
SYSLOG_IDENTIFIER=echo
MESSAGE=foo
```
As you can see, there is no unit identifier.
Recently, for slow test environments, journalctl --sync was added to the
loop in the timeout. However, journalctl --sync may be slow in such systems,
and timeout easily triggered during syncing.
Hopefully, reading journal with --follow and grep the output with an expected
line should be efficient.
Hopefully fixes#32712.
Having these named differently than the test itself mostly creates
unecessary confusion and makes writing logic against the tests harder
so let's rename the testsuite-xx units and scripts to just use the
test name itself.
