simplify Jenkins test run taking advantage of https://github.com/awslabs/aws-encryption-sdk-python/pull/46 (#4185)

diff --git a/Jenkinsfile b/Jenkinsfile
index 7f8cf6b..ca49527 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -158,9 +158,9 @@
             virtualenv .venv
             source .venv/bin/activate
             pip install ../cryptography
-            pip install pytest pytest-mock mock
+            pip install -r test/requirements.txt
             pip install -e .
-            AWS_ENCRYPTION_SDK_PYTHON_INTEGRATION_TEST_AWS_KMS_KEY_ID="arn:aws:kms:us-west-2:nonsense" pytest -m local -l
+            pytest -m local -l
         """
     ],
     [