VR: remove vpn user info when apply vpn users list (apache#9568)

Prior to this PR
```
root@r-663-VM:/var/cache/cloud# gzip -dk vpn_user_list.json.aae73e2c-32ba-44f3-bf47-426933a67bcb.gz
root@r-663-VM:/var/cache/cloud# /opt/cloud/bin/update_config.py vpn_user_list.json.aae73e2c-32ba-44f3-bf47-426933a67bcb
{'id': 'vpnuserlist', 'test': {'add': True, 'password': 'test', 'user': 'test'}}
{'vpn_users': [{'user': 'test', 'password': 'test', 'add': True}], 'type': 'vpnuserlist', 'delete_from_processed_cache': False}
 line = # Secrets for authentication using CHAP

 line = # client	server	secret			IP addresses

 line =

 line =

 line = test * test *
```

with this PR
```
root@r-663-VM:/var/cache/cloud# gzip -dk vpn_user_list.json.aae73e2c-32ba-44f3-bf47-426933a67bcb.gz
root@r-663-VM:/var/cache/cloud# /opt/cloud/bin/update_config.py vpn_user_list.json.aae73e2c-32ba-44f3-bf47-426933a67bcb
root@r-663-VM:/var/cache/cloud#
```

Author: weizhouapache

systemvm/debian/opt/cloud/bin/cs/CsFile.py

@@ -153,7 +153,6 @@ def searchString(self, search, ignoreLinesStartWith):
         logging.debug("Searching for %s string " % search)
 
         for index, line in enumerate(self.new_config):
-            print(' line = ' + line)
             if line.lstrip().startswith(ignoreLinesStartWith):
                 continue
             if search in line:

systemvm/debian/opt/cloud/bin/cs_vpnusers.py

@@ -22,8 +22,6 @@
 def merge(dbag, data):
     dbagc = copy.deepcopy(dbag)
 
-    print(dbag)
-    print(data)
     if "vpn_users" not in data:
         return dbagc