ZTS: Waiting for zvols to be available

The ZTS block_device_wait helper function should use -e when waiting
for a file to appear since it will be either a block special device
or a symlink.  This didn't cause any failures but when a device path
was specified the function would wait longer than needed.

Additionally update the most flakey test cases to pass the file path
to block_device_wait to try and improve the test reliability.  The
udev behavior on Fedora in particular can result in frequent false
positives.

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: John Kennedy <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #12515

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