fix golint warnings

[islinwb]

Currently code in many directories (excluding vendor, docs, etc.) fails to pass the golint.

Contributors are very welcome to take part in this work. Just leave the directory you want to fix in this issue.

How to do it?
A simple way is

cd ${GOPATH}/src/github.com/kubeedge/kubeedge
# get gometalinter(https://github.com/alecthomas/gometalinter)
curl -L https://git.io/vp6lP | sh
export PATH=${PATH}:${GOPATH}/src/github.com/kubeedge/kubeedge/bin
gometalinter --disable-all --enable=golint --include=<Directory-You-Want-To-Fix> ./...

Then you'll see warnings if any. Just fix them accordingly.

/cc @m1093782566 @Lion-Wei @stewart-yu

[m1093782566]

Sounds like a good plan.

[stewart-yu]

IMO, first, fixing all in one PR is OK; secondary, can we add gometalinter in vendor? no need to get it every time we run CI

[m1093782566]

secondary, can we add gometalinter in vendor? no need to get it every time we run CI

@stewart-yu I think we may need to discuss what should be in vendor? files which are referenced by other codes OR files which are used during building, checking or testing?

[sids-b]

@maurya-anuj can you please help with this ?

[m1093782566]

ping @sids-b @maurya-anuj

Any updates?

[sids-b]

ping @sids-b @maurya-anuj

Any updates?

@m1093782566 , PR will be raised by @maurya-anuj for pkg folder next week. After which we can also add golint in CI