fix(cli): remove "Error:" in the arg when calling error() in config.py

PR Closed: #658

tensorbay/cli/config.py

@@ -28,7 +28,7 @@ def _implement_config(obj: Dict[str, str], arg1: str, arg2: str) -> None:
     if arg1.startswith(("Accesskey-", "ACCESSKEY-")):
         profile_name = obj["profile_name"]
         if profile_name == "config":
-            error("Error: name 'config' is preserved for gas basic config")
+            error("Name 'config' is preserved for gas basic config")
 
         if profile_name not in config_parser:
             config_parser.add_section(profile_name)
@@ -40,13 +40,13 @@ def _implement_config(obj: Dict[str, str], arg1: str, arg2: str) -> None:
             config_parser.remove_option(profile_name, "url")
     elif arg1 == "editor":
         if not arg2:
-            error("Error: Missing editor name")
+            error("Missing editor name")
 
         if "config" not in config_parser:
             config_parser.add_section("config")
         config_parser["config"]["editor"] = arg2
     else:
-        error("Error: Wrong accesskey format")
+        error("Wrong accesskey format")
 
     with open(config_file, "w") as fp:
         config_parser.write(fp)