'kgit-s2q' doesn't remove 'rebase-apply' directory

Hello!

'kgit-s2q' in the linux recipe tries to use 'git apply' if 'git am' fails.
In this case 'kgit-s2q' manually creates a ".git/rebase-apply"
directory (https://git.yoctoproject.org/yocto-kernel-tools/tree/tools/kgit-s2q#n622)
But it looks like this directory is not removed after the patches are
applied. This creates a problem, since with this directory present git
thinks that rebase operation is still in progress.
Because of this bug 'devtool modify linux' can't perform its own
rebase operations in the "devtool_post_patch" tasks
https://git.yoctoproject.org/poky/tree/meta/classes/devtool-source.bbclass#n214
In the end this creates a situation when the local patches are not applied.

Best regards,
Konstantin Aladyshev