enable paralleltest lint check

[vladopajic]

In the commit af3ba87 paralleltest lint check was disabled for entire repository. Instead of disabling it for entire repository it should be disabled only for specific folders.

[aloknerurkar]

So this is done on purpose. There is no point maintaining this list of packages to exclude the paralleltest. Instead the check used here is a more lenient one as it only checks for correct usage and doesnt make it compulsory. There are tests in this package which will not be rewritten for parallel test usecase.