LuyaoZhong 8d4ae4ffc4 bug-fix: 'bytes' type in python3 cause command fail
'str' type in python2 is 'bytes' type in python3,
when use python3, we will get a prefix 'b':

sudo ip netns exec b'qrouter-39cc2b45-a27c-49c5-94a6-26443a49ac63' ip
neigh
--------------------------------------------------------------------------
*** Failed to run 'sudo ip netns exec
b'qrouter-39cc2b45-a27c-49c5-94a6-26443a49ac63' ip neigh': Command 'sudo
ip netns exec b'qrouter-39cc2b45-a27c-49c5-94a6-26443a49ac63' ip neigh'
returned non-zero exit status 1.

The message above is raised by running tools/worlddump.py with python3.

Change-Id: Ic254af86fa27729839f00c0ad4a5bbbc9e545a09
2020-02-19 08:37:45 +00:00
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