Check Python version on application launch

[dgaliffiAMD]

Cherry pick PR#393

• Check that the minimum required Python (3.8) version is used.

Prints a descriptive error message, rather than a cryptic import failure, if minimum Python version is not met.

Internal ticket SWDEV-477233.

• Disable the RPM mangling of shebangs.

The are changing the #!/usr/bin/python3 to #!/usr/libexec/platform-python. With this set, omniperf is always using the platform installed version of python, which is python 3.6 on RHEL 8. Using virtual environments, like conda, did not work.

• Fix pylint issues

---