install_ovn.sh: the ovs repo of centos has moved to https
install_ovn.sh: the ovs repo of centos has moved to https

Signed-off-by: YaoZengzeng <24ab6c0308baa96f7d187360119779e115ef34f9@zju.edu.cn>

shettyg/ovn-kubernetes,shettyg/ovn-kubernetes,shettyg/ovn-kubernetes