[Logger] Modify initialization error message of logger instance

[Logger] Modify initialization error message of logger instance

- Runtime error occurs when an app is executed in a place other
  than the home directory excepted Android and Tizen
- Currently, Android and Tizen don't make logger
- If an user runs an app using nntrainer in a place where
  the logger cannot be initialized, the path is shown for help
- In case of Ubunut, logger unable to initialize on '/usr/bin/',
  /usr/lib/' and etc

**Self evaluation:**
1. Build test:   [X]Passed [ ]Failed [ ]Skipped
2. Run test:     [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: hyunil park <hyunil46.park@samsung.com>