Add validation for IPv6 addresses passed to Fault Injection APIs

[amogh09]

Summary

Fault Injection APIs only support IPv4 addresses. However, they currently do not validate that an IP address passed to them is IPv4 and not IPv6 which causes a server error. This change makes the APIs fail with a validation error if an IP address passed is IPv6.

Testing

Did some manual testing.

bash-5.2# curl -XPOST --data '{"DelayMilliseconds": 500, "JitterMilliseconds": 0, "Sources": ["2001:db8::68"]}' ${ECS_AGENT_URI}/fault/v1/network-latency/start
{"Error":"invalid value 2001:db8::68 for parameter Sources"}bash-5.2#
bash-5.2# curl -XPOST --data '{"DelayMilliseconds": 500, "JitterMilliseconds": 0, "Sources": ["2001:db8::/32"]}' ${ECS_AGENT_URI}/fault/v1/network-latency/start
{"Error":"invalid value 2001:db8::/32 for parameter Sources"}bash-5.2#
bash-5.2# curl -XPOST --data '{"LossPercent": 50, "Sources": ["2001:db8::68"]}' ${ECS_AGENT_URI}/fault/v1/network-packet-loss/start
{"Error":"invalid value 2001:db8::68 for parameter Sources"}bash-5.2#
bash-5.2# curl -XPOST --data '{"LossPercent": 50, "Sources": ["2001:db8::/32"]}' ${ECS_AGENT_URI}/fault/v1/network-packet-loss/start
{"Error":"invalid value 2001:db8::/32 for parameter Sources"}bash-5.2#
bash-5.2# curl -XPOST --data '{"Port": 80, "Protocol": "tcp", "TrafficType": "egress", "SourcesToFilter":["2001:db8::68"]}' ${ECS_AGENT_URI}/fault/v1/network-blackhole-port/start
{"Error":"invalid value 2001:db8::68 for parameter SourcesToFilter"}bash-5.2#
bash-5.2# curl -XPOST --data '{"Port": 80, "Protocol": "tcp", "TrafficType": "egress", "SourcesToFilter":["2001:db8::/32"]}' ${ECS_AGENT_URI}/fault/v1/network-blackhole-port/start
{"Error":"invalid value 2001:db8::/32 for parameter SourcesToFilter"}bash-5.2#

New tests cover the changes: yes

Description for the changelog

Bugfix: Add validation to prevent Fault Injection APIs from accepting IPv6 addresses.

Additional Information

Does this PR include breaking model changes? If so, Have you added transformation functions?

Does this PR include the addition of new environment variables in the README?

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.