Enable test cases for host's network settings

What test cases are added
    - Added test cases to set static and dhcp setting using REST
    - Added test cases to set static and dhcp setting using IPMI
    - Added test case to clear settings using IPMI
    - Added test cases to set invalid settings using both REST and IPMI

Resolves openbmc/openbmc-test-automation#48

Change-Id: Ia9ac56ad884318de703406d070aa7985474fab05
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
3 files changed