[VPP-649] IP address subnet validation - FD.io Jira

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When attempting to configure two IP addresses from the same subnet on an interface:

vat# sw_interface_add_del_address sw_if_index 0 10.0.0.1/24
vat# sw_interface_add_del_address sw_if_index 0 10.0.0.2/24

The second command fails(as it should) but it returns "retval": 0

vat# ip_address_dump ipv4 sw_if_index 0

[

{ "ip": "10.0.0.1", "prefix_length": 24 }

]

blocks

HC2VPP-92 Add more descriptive exception handling for subnet errors