add option "-k" to limit tests in test-install command (#2635)
add option "-k" to limit tests in test-install command (#2635)

* add option "-k" to limit tests in test-install command

* remove "not notebooks_test" argument

* explicit is better than a comment

* Remove last reference to notebook tests

* Simplify nesting

allenai/allennlp,allenai/allennlp,allenai/allennlp,allenai/allennlp