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DataSourceOVF attempts to find iso files via walking os.listdir('/dev/')
which is far too wide. This approach is too invasive and can sometimes
race with systemd attempting to fsck and mount devices.
Instead, utilize cloudinit.util.find_devs_with to filter devices by
criteria (which uses blkid under the covers). This results in fewer
attempts to mount block devices which do not contain iso filesystems.
Unittest changes include:
- cloudinit.tests.helpers; introduce add_patch() helper
- Add unittest coverage for DataSourceOVF use of transport_iso9660
LP: #1718287
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