script: allow collecting management server and kvm agent logs

Adds a utility script to collect CloudStack logs for troubleshooting.

* Collects management server and KVM agent logs.
* Supports collecting logs for a specific date.
* Discovers management servers and KVM hosts using CloudMonkey, with database fallback.
* Supports limiting collection to specified KVM hosts.
* Packages collected logs into a compressed archive.

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

Author: shwstppr