[Process] Moved process information retrieval into protected method.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | 

This is a simple move the of the `proc_get_status` call into a protected method so that it may potentially be overridden in derivative classes.  Without this call isolated an override of any method accessing the private member `processInformation` would need to be overridden as well.

No documentation seems to cover this so I did not include a documentation pull request.  If this is in error, I will happily update the relevant documentation.