Fixed a few typos in firewall tests. VPC was being passed instead of the subnet. Also made VPC conditional slightly broaded to include OPTIONAL.
Fixed the createLoadBalancerHealthCheck test
Fixed firewall tests to allow testing against the likes of EC2-VPC where VPC is implied even if you didn't ask for it.

Conflicts:
	src/main/java/org/dasein/cloud/test/network/NetworkResources.java
Merge pull request #40 from maksimov/2014.03

2014.03