Add test to verify pkg_resources imports work.

test/integration/targets/pkg_resources/aliases

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+shippable/posix/group1

test/integration/targets/pkg_resources/lookup_plugins/check_pkg_resources.py

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+"""
+This test case verifies that pkg_resources imports from ansible plugins are functional.
+
+If pkg_resources is not installed this test will succeed.
+If pkg_resources is installed but is unable to function, this test will fail.
+
+One known failure case this test can detect is when ansible declares a __requires__ and then tests are run without an egg-info directory.
+"""
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+# noinspection PyUnresolvedReferences
+try:
+    from pkg_resources import Requirement
+except ImportError:
+    Requirement = None
+
+from ansible.plugins.lookup import LookupBase
+
+
+class LookupModule(LookupBase):
+    def run(self, terms, variables=None, **kwargs):
+        return []

test/integration/targets/pkg_resources/tasks/main.yml

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+- name: Verify that pkg_resources imports are functional
+  debug:
+    msg: "{{ lookup('check_pkg_resources') }}"