Revert "oeqa/selftest/devtool: fix test_devtool_add_git_style2"

This reverts commit ab6d3e3d645ffc343f434bf731339fa237df027a
from poky repository.

The previous reverted commit was a workaround. The fix
"oeqa/selftest/devtool: fix _test_devtool_add_git_url"
tackle the issue. So, the workaround is not needed anymore.

Signed-off-by: Alexandre Truong <alexandre.truong@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 731f47ec)
Signed-off-by: Steve Sakoman <steve@sakoman.com>