Remove ucloud_common and put its files under ucloud.common subpackage.

Remove individual config.py used by every component and put them into single config.py ucloud/config.py
Use /etc/ucloud/ucloud.conf for Environment Variables
Refactoring and a lot of it
Make ucloud repo a package and different components of ucloud a subpackage for avoiding code duplication.
Improved logging.

filescanner/main.py

@@ -1,14 +1,13 @@
-import os
 import glob
+import os
 import pathlib
-import time
-import hashlib
 import subprocess as sp
-
-from decouple import config
-from etcd3_wrapper import Etcd3Wrapper
+import time
 from uuid import uuid4
 
+from etcd3_wrapper import Etcd3Wrapper
+
+from config import env_vars
 
 
 def getxattr(file, attr):
@@ -22,7 +21,7 @@ def getxattr(file, attr):
         value = value.decode("utf-8")
     except sp.CalledProcessError:
         value = None
-    
+
     return value
 
 
@@ -32,8 +31,8 @@ def setxattr(file, attr, value):
 
     attr = "user." + attr
     sp.check_output(['setfattr', file,
-                        '--name', attr,
-                        '--value', str(value)])
+                     '--name', attr,
+                     '--value', str(value)])
 
 
 def sha512sum(file: str):
@@ -68,12 +67,13 @@ except Exception as e:
     print('Make sure you have getfattr and setfattr available')
     exit(1)
 
+
 def main():
-    BASE_DIR = config("BASE_DIR")
+    BASE_DIR = env_vars.get("BASE_DIR")
 
-    FILE_PREFIX = config("FILE_PREFIX")
+    FILE_PREFIX = env_vars.get("FILE_PREFIX")
 
-    etcd_client = Etcd3Wrapper(host=config("ETCD_URL"))
+    etcd_client = Etcd3Wrapper(host=env_vars.get("ETCD_URL"))
 
     # Recursively Get All Files and Folder below BASE_DIR
     files = glob.glob("{}/**".format(BASE_DIR), recursive=True)
@@ -125,4 +125,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    main()