CLOUDSTACK-3535: add kvminvestigator to investirage kvm host

Conflicts:

	plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
CLOUDSTACK-2312, CLOUDSTACK-2314 : SHA256 timing attack and brute force attack fix

Signed-off-by: Chiradeep Vittal <chiradeep@apache.org>