yast2 patch should update existing file instead of creating a new one

fixes https://github.com/yast/ycp-killer/issues/468
Merge pull request #470 from lslezak/update_yast2_patch

yast2 patch should update existing file instead of creating a new one
Use the --dont-inline-include-files option when invoking Y2R
Merge pull request #471 from yast/use-dont-inline-include-files

Use the --dont-inline-include-files option when invoking Y2R