Remove shebang lines from code

Need remove shebang lines like:
   #!/usr/bin/env python
from code

Change-Id: I14b461e759d6dea7f54b2ef06c38be2fa52da433
Partial-Bug: #1281055
Filtering nodes by maintenance mode

Add support for filtering nodes on maintenance mode in the node-list
command.

Change-Id: I89ff87dbeaa9e74108cfac2c4c1ea209ea0e1556
Merge "Filtering nodes by maintenance mode"