XYZ network: Verify & delete IP address via REST

This change includes:
    1. Threshold prefix length.
    2. Lowest prefix length.
    3. Get list of all IP addresses via REST.
    4. Delete IP address and its object.
    5. Handles network loss after modifying IP.

This resolves openbmc/openbmc-test-automation#850

Change-Id: Ic426fc661466cd429c348280d08bdda8dac472d3
Signed-off-by: Prashanth Katti <prkatti1@in.ibm.com>
2 files changed