Add test runner inside qemu (pixie-io#985)

Summary: This adds the test_runner script that runs inside of qemu to
manage and
execute the test programs.

Relevant Issues: pixie-io#709

Type of change: /kind test-infra

Test Plan: Tested locally, part of the larger test infra.

Signed-off-by: Zain Asgar <zasgar@pixielabs.ai>

bazel/test_runners/qemu_with_kernel/test_runner_inside_qemu.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Copyright 2018- The Pixie Authors.
+#
+# 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+set -e
+
+function finish {
+  retval=$?
+  /bin/exit_qemu_with_status "${retval}"
+}
+
+trap finish EXIT
+trap finish ERR
+
+# This file is generated by the test launcher.
+# shellcheck disable=SC1091
+source /test_fs/test_env.sh
+
+cd "${test_base:?}"
+
+if [[ -n "${GTEST_TMP_DIR}" ]]; then
+    mkdir -p "${GTEST_TMP_DIR}"
+fi
+
+# Actually run the test and capture the return value.
+retval=0
+"${test_exec_path:?}" || retval=$?
+exit $retval