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
Merge "Fix listing security group rules"
Rename --timeout param to --http-timeout

The --timeout parameter was already used by the
load balancer subcommand so adding it as a top-level
parameter broke the load balancer commands. This
patch renames the new --timeout top-level command
to --http-timeout so it doesn't conflict with the
existing load balancer commands.

DocImpact

Closes-Bug: #1353536
Change-Id: I3d1dd9537e546191c5905e0aa5415de5308d9c7e