Add DLP and Tasks Tests to Kokoro (GoogleCloudPlatform#1544)

* add kokoro tests for dlp

* kokoro test files for tasks

Author: averikitsch

.kokoro/presubmit_tests_dlp.cfg

@@ -0,0 +1,15 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Download secrets from Cloud Storage.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-docs-samples/.kokoro/system_tests.sh"
+}
+
+env_vars: {
+    key: "NOX_SESSION"
+    value: "dlp and py36 and not appengine"
+}

.kokoro/presubmit_tests_tasks.cfg

@@ -0,0 +1,15 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Download secrets from Cloud Storage.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-docs-samples/.kokoro/system_tests.sh"
+}
+
+env_vars: {
+    key: "NOX_SESSION"
+    value: "tasks and py36 and not appengine"
+}

.kokoro/system_tests_dlp.cfg

@@ -0,0 +1,15 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Download secrets from Cloud Storage.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-docs-samples/.kokoro/system_tests.sh"
+}
+
+env_vars: {
+    key: "NOX_SESSION"
+    value: "dlp and py36 and not appengine"
+}

.kokoro/system_tests_tasks.cfg

@@ -0,0 +1,15 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Download secrets from Cloud Storage.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-docs-samples/.kokoro/system_tests.sh"
+}
+
+env_vars: {
+    key: "NOX_SESSION"
+    value: "tasks and py36 and not appengine"
+}