Fix SecurityGroupRule scalability
Fix SecurityGroupRule scalability

For the case where a SecurityGroupRule has its remote_ips member
updated, the list of SecurityGroupRuleRemoteIp objects is reconstructed
from scratch on each update call. This patch introduces a performance
improvement that uses sets to determine additions and deletions, and
then modifies the existing list of SecurityGroupRuleRemoteIp objects
accordingly.

noironetworks/aci-integration-module,noironetworks/aci-integration-module