Added self option to security groups

[lnguyen]

No description provided.

[jrperritt]

Hmm, I'm a bit lacking in my security groups knowledge. What is the use case for this? It looks like you're setting the from_group_id to the security group ID if self is set to true. What do we gain by setting from_group_id to the rule's security group instead of leaving from_group_id unset?

[lnguyen]

Use case for this is to assigned a security group to itself. Using openstack_compute_secgroup_v2.name.id doesn't work as resources can't declare itself. This is common practice if we want vms within the security group to be able to access itself. The aws one supports this https://www.terraform.io/docs/providers/aws/r/security_group.html

[jrperritt]

Ok, LGTM.