ZTS: Make DVA pattern in zdb tests more robust
Ensure the capture ends at the first DVA in case there are multiple
DVAs on the same line by only capturing up to the first '>' character.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Ryan Moeller <ryan@ixsystems.com>
Closes #9851