fix many cpp lint errors

[guolinke]

refer to #1990

[guolinke]

BTW, this will have some conflicts with other PRs.
@StrikerRUS I think we should merge this ASAP.

[StrikerRUS]

Wow, amazing! 🎉

I'm only afraid of reinterpret_cast<void*>: #2064 (comment)

[guolinke]

@StrikerRUS yeah, but it seems the reinterpret_cast is the only way, and it actually equals to c style cast.

[guolinke]

@StrikerRUS BTW, as json11 is not maintained by us, we can disable the lint check over it.

[StrikerRUS]

@guolinke Yes, but why?.. As it's not a "submodule" (as compute) it falls into situation when it's maintained by no one. I think it's not right. Seems that the license allows to modify it. I remember there were some dangerous warnings from cpplint for json11.

[guolinke]

Okay, I think we won't modify it, so we can keep it as it is. However, if these warnings are easy to fix, we could fix it directly.