Move code in lmnet/executor directory to blueoil/cmd directory.

[tfujiwar]

This is one of the tasks of #741 .

The following scripts exist both in lmnet/executor and blueoil/cmd. We need to merge them into one. Basically the scripts in blueoil/cmd will be replaced with the scripts in lmnet/executor but we need to continue supporting both "lmnet config" and "blueoil config" in the new scripts.

• predict.py
• train.py

The other scripts exist only in lmnet/executor directory. We can just move them and change import paths.

• other scripts

[tfujiwar]

Done