memif pmd, does not cleanup on primary application restart

https://bugs.dpdk.org/show_bug.cgi?id=437

            Bug ID: 437
           Summary: memif pmd, does not cleanup on primary application
                    restart
           Product: DPDK
           Version: 20.02
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

target:

cmd: ./build/l2fwd --vdev=net_tap0 --vdev=net_memif,role=master -l 8,51 --socket-mem=104,0 --socket-limit=1024,0 --file-prefix=1 --proc-type=primary --no-pci --log-level=eal,8 -- -p 0x3 -T 1

steps: on success or failure for l2fwd in first attempt, restart the application once again

Error:
`
memif_socket_create(): Failed to setup socket /run/memif.sock: Address already in use
vdev_probe(): failed to initialize net_memif device
EAL: Bus (vdev) probe failed.
EAL: Module /sys/module/vfio not found! error 2 (No such file or directory) MAC updating enabled
EAL: Error - exiting with code: 1
Cause: Invalid portmask; possible (0x1)

`

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