Add test that calls sbws init

tests/integration/test_sbws.py

+from tempfile import TemporaryFile
+import subprocess
+import os
+
+
+def test_simple_init(tmpdir):
+    # out = None
+    err = None
+    with TemporaryFile('w+t') as stdout, TemporaryFile('w+t') as stderr:
+        retcode = subprocess.call(
+            'sbws -d {} --log-level debug init'.format(tmpdir).split(),
+            stdout=stdout, stderr=stderr)
+        stdout.seek(0, 0)
+        stderr.seek(0, 0)
+        # out = stdout.read()
+        err = stderr.read()
+    assert retcode == 0
+    assert len(err) == 0
+    conf_fname = os.path.join(str(tmpdir), 'config.ini')
+    assert os.path.exists(conf_fname)
+    with open(conf_fname, 'rt') as fd:
+        assert len(fd.read()) > 0