Improve Contiv test coverage

This CIR is to improve Contiv test coverage.

Here are the use cases:

As a contiv developer, I would like to have a overall contiv test plan which include test cases and support matrix
As a contiv developer, I would like to verify data plane traffic functionality
As a contiv developer, I would like to verify data plane performance
As a contiv user, I would like to know the data plane performance result
As a contiv developer, i would like to verify contiv scalability limit
As a contiv user, I would like to know the contiv scalability limit
As a contiv developer, I would like to verify ACI-gw functionality
As a contiv developer, I would like to verify contiv resilience tests
As a contiv developer, I would like to verify contiv policy tests
As a contiv developer, I would like to increase test automation coverage
As a contiv developer, I would like to verify contiv installer

[CIR-2085] created by kahou.lei

blaksmit / issue-test