[FEATURE] Enable the script to work for PowerVC

[cs-zhang]

Current script only works for PowerVS, now we want it to support PowerVC too.

[yussufsh]

I feel it is better to create a common script for both powervs and powervc.
We can start with moving the common functions to a script and source it in the main script via the version (tag). This common script can be sourced from both the script.

Lets start with moving the functions for now then we can decide on how we can reuse the common code.

[cs-zhang]

That's what I am doing now, create a common script, source it form script for PowerVS and PowerVC.