Retry curl command verifying Slirp connectivity
Retry curl command verifying Slirp connectivity

The orignal code using curl was problematic due to its lack of retry -
temporary connection drop would fail the test. With this patch, the curl
command is retried.

Signed-off-by: Petr Horáček <3d568cef31bb4e17f01fe4b853b0268612d32ece@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt