gitignore: Add generated config files to .gitignore
gitignore: Add generated config files to .gitignore

We don't want to stage and commit those generated config files by
mistake. Then let's add them to .gitignore file.

Signed-off-by: Sebastien Boeuf <90b401417360b1924ef3f520ddee932686110f85@intel.com>

devimc/runtime,clearcontainers/runtime,chavafg/runtime,clearcontainers/runtime,chavafg/runtime,devimc/runtime