updater: expand ~ to $HOME in config path of uploader script

Change-Id: I8c5ce1a2c256fbaf046fbe73e5574d48cd3f3a7a

bin/update/config.py

 
 import configparser
+import os
 
 class Config(object):
 
@@ -13,7 +14,7 @@ class Config(object):
 
 def parse_config(config_file):
     config = configparser.ConfigParser()
-    config.read(config_file)
+    config.read(os.path.expanduser(config_file))
 
     data = Config()
     updater_data = config['Updater']

bin/update/upload_build_config.py

@@ -12,7 +12,7 @@ def main(argv):
     updater_config = sys.argv[2]
 
     config = configparser.ConfigParser()
-    config.read(updater_config)
+    config.read(os.path.expanduser(updater_config))
 
     user = config["Updater"]["User"]
     password = config["Updater"]["Password"]