[Enhancement] Network Interface Time Buffer Issue #907

Summary

Time buffer issues happen when setting network interfaces in zVM Cloud Connector. Multiple sequential network configuration steps fail when the next step executes before the previous step completes, resulting in "device not ready" errors.

Details

The network interface configuration process involves multiple sequential steps:

1. znetconf command - Sets device online

2. cio_ignore command - Removes device from ignored list

3. IP ADDR ADD command - Assigns IP address to device

Some of these steps might have different time of completion. Like, steps 2 and 3 can execute before step 1 completes, causing failures due to device not being ready. We can use something like sleep but it won't solve all situations. New method such as udevadm is required

Launchpad Ref - https://bugs.launchpad.net/python-zvm-sdk/+bug/1771710