Add rspec test to validate config format

[yeetengangIntel]

Fix for issue #241

• Check config format for need_kconfig part
• Format requirements:
  1. Config name not start with CONFIG_
  2. Config value only contain n, m, y, i386, x86_64, or empty

[yeetengangIntel]

For now there are 4 files in /include directory that does not met the requirements due to integers or multiple values passed in:

1. include/ndctl
2. include/kernel-selftests
3. include/blktests
4. include/kernel-selftests-bpf @rli9 Based on issue 241 require config value to only contain n, m, y, i386, x86_64, or empty, so would like to check if these 4 files values are expected?

[rli9]

Based on issue 241 require config value to only contain n, m, y, i386, x86_64, or empty, so would like to check if these 4 files values are expected?

Sorry, the int value is also valid. I didn't mention it in the initial issue.

[rli9]

Thanks, can you help combine all commits into a single one?

[rli9]

thanks for the patch