Exercise cleanup

* Make common steps consistent
* Make comments consistent

aggregates.sh
boot_from_volume.sh
client-args.sh
client-env.sh
euca.sh
floating_ips.sh
sec_groups.sh
swift.sh
volumes.sh

Change-Id: Ib93dcdfdead93c259e3cd184fbc5ccc0a4a87c9a
Added option Q_FLOATING_ALLOCATION_POOL to define an allocation-pool for floating IPs.

Change-Id: If31b34ebb8095aa260c19292cf63826522908db9
Merge "Added option Q_FLOATING_ALLOCATION_POOL to define an allocation-pool for floating IPs."
Merge "Exercise cleanup"