test: Test process.setuid for bad argument types

[dsinecos]

• Version: master
• Platform: 16.04.1, Ubuntu
• Subsystem: test

While reading through the tests I found that there is a test for bad argument types for process.seteuid but there isn't a corresponding test ( process.setuid({}) ) for bad argument types for process.setuid

I think that a corresponding test could be added in the file to test bad argument types for process.setuid as well.

If this makes sense, I'd like to contribute through a PR on this.

[gireeshpunathil]

@dsinecos - go for it!