[AWS|ELB] fix InstancePort parsing in describe_load_balancers
[AWS|ELB] load_balancer_tests cleanup cert from potentially failed previous test run
[AWS] print out raw response string when DEBUG_RESPONSE env var is set
[AWS|ELB] test describe_load_balancers parser directly
[AWS|ELB] emulate AWS behavior: no BackendServerDescriptions by default
[AWS|ELB] fix set_load_balancer_polices_for_backend mock to track set BackgroundServerDescriptions
[AWS|ELB] update helper to include BackendServerDescriptions and OtherPolicies
[AWS|ELB] fix backend server descriptions model test.
Reload the elb to pickup the latest descriptions.
[AWS|ELB] mocks emulate AWS behavior
when setting a policy for the backend server a subsequent describe is
required to update the local state with the current BackendServerDescriptions
Merge pull request #2012 from mikehale/aws-elb-parser-fix

Aws elb parser fix