Fix listing security group rules

It was failing when there are too many security groups, since we're
hitting a RequestURITooLong exception.

Co-Authored-By: Vincent Untz <vuntz@suse.com>
Co-Authored-By: Ilya Shakhat <ishakhat@mirantis.com>
Change-Id: If94b6a2ed6878efad1224e056ecf43e65e85e821
Closes-Bug: 1271462