PY-23926: Check teamcity plugin via setuptools api and do not add it

if already registered.

python/helpers/pycharm/_jb_pytest_runner.py

@@ -7,8 +7,7 @@ from _pytest.config import get_plugin_manager
 
 from _jb_runner_tools import jb_start_tests, jb_patch_separator, jb_doc_args, JB_DISABLE_BUFFERING
 from teamcity import pytest_plugin
-
-
+from pkg_resources import iter_entry_points
 
 if __name__ == '__main__':
     path, targets, additional_args = jb_start_tests()
@@ -22,7 +21,8 @@ if __name__ == '__main__':
     # to prevent "plugin already registered" problem we check it first
     plugins_to_load = []
     if not get_plugin_manager().hasplugin("pytest-teamcity"):
-        plugins_to_load.append(pytest_plugin)
+        if "pytest-teamcity" not in map(lambda e:e.name, iter_entry_points(group='pytest11', name=None)):
+            plugins_to_load.append(pytest_plugin)
 
     args = sys.argv[1:]
     if JB_DISABLE_BUFFERING and "-s" not in args:

python/setup-test-environment/build.gradle

@@ -12,7 +12,7 @@ envs {
   packages = ["pip", "setuptools"]
   _64Bits = true
 
-  conda "django19", "2.7", ["django==1.9", "tox", "nose", "pytest", "behave", "lettuce>=0.2.22", "unittest2"], true
+  conda "django19", "2.7", ["django==1.9", "tox", "nose", "pytest", "behave", "lettuce>=0.2.22", "unittest2", "teamcity-messages"], true
   textfile "django19/tags.txt", "python2.7\ndjango\nnose\npytest\nbehave\nlettuce\npackaging\ntox\nunittest2"
 
   conda "django110", "3.4", ["django==1.10", "django-nose"], false