Refactoring, Removal of most global vars, config default path is ~/ucloud/

setup.py

@@ -1,3 +1,5 @@
+import os
+
 from setuptools import setup, find_packages
 
 with open("README.md", "r") as fh:
@@ -39,5 +41,5 @@ setup(name='ucloud',
           'etcd3 @ https://github.com/kragniz/python-etcd3/tarball/master#egg=etcd3',
       ],
       scripts=['scripts/ucloud'],
-      data_files=[('/etc/ucloud/', ['conf/ucloud.conf'])],
+      data_files=[(os.path.expanduser('~/ucloud/'), ['conf/ucloud.conf'])],
       zip_safe=False)