zbd/003: Reset zones when the test device has max_active_zones limit

zbd/003: Reset zones when the test device has max_active_zones limit

When the test target device has the max_active_zones limit, write
operations by test case zbd/003 may open zones beyond the limit and
trigger write failures.

To avoid the failure, check max_active_zones limit of the test target
device. If the limit is valid, reset all zones of the device at test
start to ensure that number of open zones does not exceed the limit.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>