Added an output_format option for vnctl's configuration file. Default is 'yml'
Added a default configuration file for vnctl.conf... For now a config file isn't required for it but this serves as documentation.
Merge pull request #144 from axsh/feature-vnctl-yml

yml output for vnctl
Merge branch 'master' into feature-secg-prototype-stateful-simulation
Delete the catch flows for new egress connections when removing an interface
Split connection tracking off of security groups into its own manager class
Set the default rule of EGRESS_FILTER as accept and removed the old accept code
Updated rspec unit tests to no longer expect the accept flow in EGRESS_FILTER
Made a lookup table for dynamic ingress filter rules
Got rid of the catch flows for static security group rules. They were adding unneeded complexity