Add ci scripts (#1)

* Add ci scripts

* Move config files to ci/kokoro/docker

* Remove dump-logs etc

* Simplified grpc installation

* Add Ubuntu 16.04 kokoro config

* Address code review

ci/colors.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+if [ -z "${COLOR_RESET+x}" ]; then
+  if type tput >/dev/null 2>&1; then
+    readonly COLOR_RED="$(tput setaf 1)"
+    readonly COLOR_GREEN="$(tput setaf 2)"
+    readonly COLOR_YELLOW="$(tput setaf 3)"
+    readonly COLOR_RESET="$(tput sgr0)"
+  else
+    readonly COLOR_RED=""
+    readonly COLOR_GREEN=""
+    readonly COLOR_YELLOW=""
+    readonly COLOR_RESET=""
+  fi
+fi