added Buildkite pipeline and integration tests

This pipeline contains the tests that are currently run for
kvm-ioctls. The pipeline also has a step that runs the coverage
test defined in integration_tests/test_coverage.py.

The purpose of this pipeline is to be used by all rust-vmm
repositories to ensure we keep the same quality bar for all crates.

Signed-off-by: Andreea Florescu <fandree@amazon.com>

integration_tests/utils.py

@@ -0,0 +1,11 @@
+# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+import os
+
+
+def get_repo_root_path():
+    """Terrible hack to get the root path of the repository."""
+    integration_tests_path = os.path.dirname(os.path.realpath(__file__))
+    rust_vmm_ci_path = os.path.dirname(integration_tests_path)
+
+    return os.path.dirname(rust_vmm_ci_path)