EKG_HOST does not accept resolvable hostnames

[TrevorBenson]

Describe the bug The test for EKG_HOST is to validate an IPv4 address. When using containers / kubernetes with separate pods for node and cncli setting the name of the node service as EKG_HOST, which is resolvable, resulting in Not a valid IP format set for EKG host, please check env file!

To Reproduce Steps to reproduce the behavior:

1. Define EKG_HOST as hostname that resolves to IPv4, for example EKG_HOST=localhost
2. Run cncli.sh leaderlog
3. See error

Expected behavior Resolvable names should not cause errors.

Version:

• OS: Debian
• Product version: CNTools 13.2.2
• Cardano Node version: 9.2.1
• Network you're connecting to: 2022-10-25T00:00:00Z