We are running into race conditions with glean, which ssh-keygen -A is
not handling properly. So, create a new script to first check if the
file exists, then use 'yes' to disable overwriting of existing files.
Change-Id: Ie82e1e3f832fcc8f32c7e1335c5f0ee16d36f9a8
Signed-off-by: Paul Belanger <pabelanger@redhat.com>