test/cuse: wait for device after reset

This patch adds waitforblk() after rebinding the driver.
If timing was unfortunate, it was possible to issue
id-ctrlr command to a device that was not yet ready.
Meaning the support for fw command was not read properly.

No error was reported due to "set +e", so this patch moves
it till after id-ctrlr.

Example of the error:
# get_nvme_ctrlr_from_bdf 0000:82:00.0
# readlink -f /sys/class/nvme/nvme9
# grep 0000:82:00.0/nvme/nvme
# bdf_sysfs_path=/sys/devices/pci0000:80/0000:80:03.0/0000:82:00.0/nvme/nvme9
# [[ -z /sys/devices/pci0000:80/0000:80:03.0/0000:82:00.0/nvme/nvme9 ]]
# basename /sys/devices/pci0000:80/0000:80:03.0/0000:82:00.0/nvme/nvme9
# printf '%s\n' nvme9
# nvme_name=nvme9
# [[ -z nvme9 ]]
# set +e
# ctrlr=/dev/nvme9
# ns=/dev/nvme9n1
# /usr/local/src/nvme-cli/nvme id-ctrl /dev/nvme9
# grep oacs
# cut -d: -f2
/dev/nvme9: Resource temporarily unavailable

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: I5728a5062cd553eb39d18d9869fdf56319a27777
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2950


Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Karol Latecki <karol.latecki@intel.com>