Update the default version to release-3.1

Created by: pixiake

The default tag is updated to release-3.1 The default namespace is updated to kubespheredev

default images: kubespheredev/ks-apiserver:release-3.1 kubespheredev/ks-controller-manager:release-3.1 kubespheredev/ks-console:release-3.1 kubespheredev/ks-installer:release-3.1

Signed-off-by: pixiake guofeng@yunify.com