[dts][PATCH V2] tests/dpdk_hugetlbfs_mount_size: fix verify failed can't umount huge page

[Tu, Lijuan]

> Subject: [dts][PATCH V2] tests/dpdk_hugetlbfs_mount_size: fix verify failed can't
> umount huge page
> 
> 1.Add kill testpmd step in set_up.

Could you explain why it is reasonable to kill  testpmd in set_up. It has done this in tear_down, it is enough to handle the exception that testpmd not quit.

> 2.Add kill testpmd before umount hege page in tear_down.
> 
> Signed-off-by: Wei Ling <weix.ling at intel.com>