Move all tests to single directory "tests"

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>

tests/integration/__init__.py

@@ -0,0 +1,12 @@
+import os
+import subprocess
+
+
+def create_base_test_image():
+    subprocess.check_call(
+        ['podman', 'build', '-t', 'nopush/podman-compose-test', '.'],
+        cwd=os.path.join(os.path.dirname(__file__), "base_image"),
+    )
+
+
+create_base_test_image()