Changes:

1) Bugfix for --hard_reset option on the CLI, preventing an error
from being returned while trying to remove log files that are
not (still) present on the disk.

2) Better support for Access Control on Simulated Clouds, with
first-fit and random placement algorithms that do take in account
the host "size" (i.e., available memory and cpu) while placing VMs.

3) Support for (package and pip) repository IP address override
while running install/configure utilities.

4) New complete regression test run.