tools: moveconfig: a tool to move CONFIGs from headers to defconfigs

tools: moveconfig: a tool to move CONFIGs from headers to defconfigs

This tool was originally written for my local use to ease the task
of tons of CONFIG moves, but there have been some requests for
mainlining it.
So, I have tidied up the code with nicer comments, and here it is.

See the comment block of the script for usage.

The first draft was
http://patchwork.ozlabs.org/patch/430422/

Main updates are:
  - Adapted to the single .config configuration
  - Support colored log
  - Support moving multiple options at once
    (and take configs via input file only)
  - Continue even if some boards fail
    (Idea provided by Joe Hershberger)
  - Add more options
  - More comments and code cleanups

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>