Removal of methods from json/xml network_client files

Remove create_security_group, create_security_group_rule
from "json/network_client.py" and "xml/network_client.py"
and instead use "_creater"/"_updater" from "network_client_base.py"

Change-Id: I2f0b16ea832fe0704869a9d778a8d3ed518090cc
Merge "Removal of methods from json/xml network_client files"