Implement the support for Address Helper

Currently the assignment of IPv4 and IPv6 addresses to each and every interface is done manually. This becomes quite tedious and error-sensitive when the network size increases to a large scale. Here we developed a helper API through which the NeST users can automatically assign addresses for emulation.

List of Added files: topology/network.py topology/address_helper.py examples/address_helper/prrrp.py examples/address_helper/dumbbell.py examples/address_helper/prp.py examples/address_helper/multi-bottleneck.py tests/test_address_helper.py

List of Modified files: topology_map.py topology/interface.py topology/address.py

Resolves #129 (closed)

Signed-off-by: Ayushi Jain [email protected]

Signed-off-by: Divya Meena [email protected]

Signed-off-by: Himanshu Kashyap [email protected]

Signed-off-by: Pranab Nandy [email protected]

Signed-off-by: Satyam Prakash [email protected]

Signed-off-by: Swati Singh [email protected]