Efforts to make ucloud a python package

ucloud/host/helper.py

@@ -0,0 +1,13 @@
+import socket
+from contextlib import closing
+
+
+def find_free_port():
+    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
+        try:
+            s.bind(('', 0))
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        except Exception:
+            return None
+        else:
+            return s.getsockname()[1]