- Changed get_security_group_rule to find_security_group_rule as
get_security_group_rule throws an exception if the rule is not
found
- Updated docs
- Updated tests
- Renamed ethertype to ether_type to match openstacksdk's attribute
names and added the former as an alias to keep backward compat
- Renamed rule to id to match openstacksdk's attribute names and
added the former as an alias to keep backward compat
Change-Id: Ieb99f875c990e11623c81e482013d0ecb8e61055