Add u-boot-dev field mode check in BMC reset teardown.
Add u-boot-dev field mode check in BMC reset teardown.

Resolves  openbmc/openbmc-test-automation#1225

Change-Id: I5712e0c6b82f55efb1b2eb43ec6613a2ee7d922c
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation