Initial Redfish test support for OpenBMC

Changes:
- Add client library for redfish.
- New response code file for legacy vs new redfish.
- Basic test to check response code from client.

Initial Redfish test support for OpenBMC

Changes:
- Add client library for redfish.
- New response code file for legacy vs new redfish.
- Basic test to check response code from client.

Resolves openbmc/openbmc-test-automation#1424

Change-Id: I254f59d3548a83c2633eaa2a24c1945131c2825e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>

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