We need to take another lock to prevent concurrent starts from different
machines.
I manually tested it by starting three VM in parallel with:
podman machine start & podman machine start test1 & podman machine start test2
I also added a CI test that seems to work as expected (failed with the
old binary, worked with the new)
Before this patch I was able to start more than VM, with this patch it
now only starts one of them and the other ones will fail to start with
a proper error.
Signed-off-by: Paul Holzinger <pholzing@redhat.com>
e82d196269