Put integration.sh pip reqs in separate file. (#17338)

test/utils/shippable/integration-requirements.txt

@@ -0,0 +1 @@
+jmespath

test/utils/shippable/integration.sh

@@ -94,12 +94,13 @@ if [ "${test_python3}" ]; then
     test_flags="--skip-tags ${skip_tags} ${test_flags}"
 fi
 
-docker exec "${container_id}" pip install jmespath
-
 if [ "${copy_source}" ]; then
     docker exec "${container_id}" cp -a "${test_shared_dir}" "${test_ansible_dir}"
 fi
 
+docker exec "${container_id}" \
+    pip install -r "${test_ansible_dir}/test/utils/shippable/integration-requirements.txt" --upgrade
+
 if [ "${test_python3}" ]; then
     docker exec "${container_id}" sed -i -f \
         "${test_ansible_dir}/test/utils/shippable/python3-test-target-blacklist.txt" \