Add docker-based test scripts

Enable running tests under Docker. This makes it easier to spin up an
environment with all dependencies (especially the multiple versions of
openssl and gnutls needed).
* tests/docker/xenial/Dockerfile: Definition for the docker image,
  including local builds for openssl and gnutls.
* tests/scripts/docker_env.sh: New helper script that creates the Docker
  image and has a function to run a command in the Docker container.
* tests/docker/all-in-docker.sh: Wrapper for all.sh under Docker.
* tests/docker/basic-in-docker.sh: Script that runs the same commands as
  .travis.yml, in Docker.
* tests/ssl-opt-in-docker.sh: Wrapper to run ssl-opt.sh in Docker.
* tests/compat-in-docker.sh: Wrapper to run compat.sh in Docker.
* tests/make-in-docker.sh: Wrapper to run make in Docker.

Change-Id: Ie092b1deed24c24c3859754535589523ce1d0a58

tests/scripts/basic-in-docker.sh

@@ -0,0 +1,37 @@
+#!/bin/bash -eu
+
+# basic-in-docker.sh
+#
+# This file is part of mbed TLS (https://tls.mbed.org)
+#
+# Copyright (c) 2018-2019, ARM Limited, All Rights Reserved
+#
+# Purpose
+# -------
+# This runs a rough equivalent of the travis.yml in a Docker container.
+# The tests are run for both clang and gcc.
+#
+# Notes for users
+# ---------------
+# See docker_env.sh for prerequisites and other information.
+
+source tests/scripts/docker_env.sh
+
+run_in_docker tests/scripts/recursion.pl library/*.c
+run_in_docker tests/scripts/check-generated-files.sh
+run_in_docker tests/scripts/check-doxy-blocks.pl
+run_in_docker tests/scripts/check-names.sh
+run_in_docker tests/scripts/check-files.py
+run_in_docker tests/scripts/doxygen.sh
+
+for compiler in clang gcc; do
+    run_in_docker -e CC=${compiler} cmake -D CMAKE_BUILD_TYPE:String="Check" .
+    run_in_docker -e CC=${compiler} make
+    run_in_docker -e CC=${compiler} make test
+    run_in_docker programs/test/selftest
+    run_in_docker -e OSSL_NO_DTLS=1 tests/compat.sh
+    run_in_docker tests/ssl-opt.sh -e '\(DTLS\|SCSV\).*openssl'
+    run_in_docker tests/scripts/test-ref-configs.pl
+    run_in_docker tests/scripts/curves.pl
+    run_in_docker tests/scripts/key-exchanges.pl
+done