CLOUDSTACK-5061 - Cloudstack doesn't consider storage overprovisioning factor when using thin Provisioning over VMWare VMFS datastores

Fix is use the storage overprovisioning factor (global configuration parameter "storage.overprovisioning.factor") to calculate total provisioning capacity for storage space allocation over VMFS based storage pools as well.
There are two level of thin provisioning provided in VMware, storage level and file-level (VMDK) thin provisioning. in CloudStack, all volumes are provisioned with thin VMDK format, so at hypervisor level, we ALWAYS do thin provisioning. If storage vendor has the ability to provide storage level thin provisioning in addition to VMDK thin provisioning, it is also allowed since it is transparent to Cloudstack.

Signed-off-by: Sateesh Chodapuneedi <sateesh@apache.org>
Squashed commit of the Palo Alto Networks firewall integration plugin.

This patch adds a network plugin to support Palo Alto Networks firewall (their appliance and their VM series firewall).

More information in the FS: https://cwiki.apache.org/confluence/display/CLOUDSTACK/Palo+Alto+Firewall+Integration

Features supported are:
- List/Add/Delete Palo Alto service provider
- List/Add/Delete Palo Alto network service offering
- List/Add/Delete Palo Alto network with above service offering
- Add instance to the new network (creates the public IP and private gateway/cidr on the PA as well as the source nat rule)
- List/Add/Delete Ingress Firewall rule
- List/Add/Delete Egress Firewall rule
- List/Add/Delete Port Forwarding rule
- List/Add/Delete Static Nat rule
- Supports Palo Alto Networks 'Log Forwarding' profile globally per device (additional docs to come)
- Supports Palo Alto Networks 'Security Profile Groups' functionality globally per device (additional docs to come)

Knowns limitations:
- Only supports one public IP range in CloudStack.
- Currently not verifying SSL certificates when creating a connection between CloudStack and the Palo Alto Networks firewall.
- Currently not tracking usage on Public IPs.

Signed-off-by: Sheng Yang <sheng.yang@citrix.com>
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