Fix the error when destroying the network experiment

[xcaspar]

Signed-off-by: xcaspar changjun.xcj@alibaba-inc.com

Describe what this PR does / why we need it

Solve the problem of using the --force flag to return a RTNETLINK answers: Invalid argument\\nWe have an error talking to the kernel error.

Does this pull request fix one issue?

Describe how you did it

Use uid equal to 0 to determine the execution authority.

Describe how to verify it

Package and test it.

# ./blade c network delay --interface eth0 --time 20
{"code":200,"success":true,"result":"b09acbf1e9c5617e"}
# ./blade c network delay --interface eth0 --time 20 --local-port 80 --force
{"code":200,"success":true,"result":"0bfdf627300c4c35"}

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