runtime: delete debug option in virtiofsd

virtiofsd's debug will be enabled if hypervisor's debug has been
enabled, this will generate too many noisy logs from virtiofsd.

Unbind the relationship of log level between virtiofsd and
hypervisor, if users want to see debug log of virtiofsd,
can set it by:

  virtio_fs_extra_args = ["-o", "log_level=debug"]

Fixes: #3303

Signed-off-by: bin <bin@hyper.sh>

src/runtime/virtcontainers/qemu.go

@@ -499,7 +499,6 @@ func (q *qemu) createVirtiofsDaemon(sharedPath string) (VirtiofsDaemon, error) {
 		sourcePath: sharedPath,
 		socketPath: virtiofsdSocketPath,
 		extraArgs:  q.config.VirtioFSExtraArgs,
-		debug:      q.config.Debug,
 		cache:      q.config.VirtioFSCache,
 	}, nil
 }