Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use print as a function for Python 3 [PEP 3105]

Import print_function from the __future__ module
to activate this for Python 2. This works as far back as Python 2.6.0a2:
https://docs.python.org/2/library/__future__.html

[PEP 3105] https://www.python.org/dev/peps/pep-3105/

Spelling fixes for tools/

Add some $FreeBSD$ tags so svn will allow the commit.

I forgot to commit this fix that is now kgdb aware...

add a set of scripts that I posted to -current last year. This makes
debugging kernels and kernel modules much easier. It will automaticly
locate kernel source, extract kernel module information, and rerun gdb
to load kernel module symbol information (if available by compiling module
w/ debuging symbols).

I have not run these recently, so may need to be updated to work with
gdb6. Feel free to fix as appropriate for -current.