AETHER-2788 Use parameter from configuration to configure eNB

AETHER-2725	CWMP fault returns by eNodeB
AETHER-2692	Check the XML sent by eNodeB and ACS are valid
AETHER-2691	Research on eNodeB TR-069 service issue
AETHER-2788     Use parameter from configuration to configure eNB
AETHER-2789     Load enodeb configuration by the serial number
AETHER-2821     Configure the PLMN which is current not supported by enodebd
AETHER-2839     Create acs_common to own the common attribute of eNodeb configuration
AETHER-2831     Writing documentation of configuring enodebd

This patch contains above jira tickets.
It can work and configure the eNodeB with single configuration now.

Change-Id: I4875d099246a1995de420c4947e7a99823055161
diff --git a/configuration/mconfig_managers.py b/configuration/mconfig_managers.py
index bd39c4c..3b76418 100644
--- a/configuration/mconfig_managers.py
+++ b/configuration/mconfig_managers.py
@@ -157,7 +157,7 @@
                 mconfig_str = cfg_file.read()
             return self.deserialize_mconfig(mconfig_str)
         except (OSError, json.JSONDecodeError, json_format.ParseError) as e:
-            raise LoadConfigError('Error loading mconfig') from e
+            raise LoadConfigError('Error loading mconfig, mconfig may have format issue') from e
 
     def load_service_mconfig(
         self, service_name: str,