tools: Remove print_function.

Tweaked by tabbott to exclude the linter libraries.

tools/documentation_crawler/documentation_crawler/spiders/check_documentation.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
 
 import os
 import pathlib

tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
 
 import os
 

tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
 
 import logging
 import re