Add integration tests for the aws_internet_gateway provider.
Add integration tests for the aws_internet_gateway provider.

ii/chef-provisioning-aws,tarak/chef-provisioning-aws,msonnabaum/chef-provisioning-aws,getaroom/chef-provisioning-aws,Fodoj/chef-provisioning-aws,Mindera/chef-provisioning-aws,chef/chef-provisioning-aws,chef/chef-provisioning-aws,miguelcnf/chef-provisioning-aws,redterror/chef-provisioning-aws