logging: Add possibility to log into file

[kosstennbl]

Description

Add processing of environment variables LOGPATH and LOG_PATH If either one exists - logger will log into the file on that path instead of STDOUT.

Issues:

Refs: #2000

How has this been tested:

Manual testing of the functionality. Running new spec.

Types of changes:

New non-breaking feature

Checklist:

Documentation No documentation update is needed.