[DPDK/DTS Bug 1983] dts: resolve driver bind error

[bugzilla at dpdk.org]

http://bugs.dpdk.org/show_bug.cgi?id=1983

            Bug ID: 1983
           Summary: dts: resolve driver bind error
           Product: DPDK
           Version: 26.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: DTS
          Assignee: dev at dpdk.org
          Reporter: abailey at iol.unh.edu
                CC: juraj.linkes at pantheon.tech, probb at iol.unh.edu
  Target Milestone: ---

If a system starts with the NICs bound to no drivers when DTS is run, DTS will
try to bind them back to no driver at the end of the test run. When DTS tries
to execute this behaviour, it run "dpdp-devbind.py -b [pci address]". This
causes DTS to crash since an empty string is not a valid driver. DTS should use
-u to unbind in this case to prevent crashing.

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