test-parallel-mount-local reliably fails when my machines are
under load (like running the test suite in parallel). The
issue is /usr/libexec/gvfs-udisks2-volume-monitor fiddling with
the fuse mounts, preventing them from being unmounted.
./fuse/guestunmount defaults to 5 unmount retries with increasing
time backoff, but apparently that isn't enough. Bumping it to
use 10 retries makes things more reliable for me.
Signed-off-by: Cole Robinson <crobinso@redhat.com>
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