supported.conf: mark vsockmon as supported (bsc#1066369)
    
    This module creates a device receiving copies of vsock traffic so that it
    packets can be monitored e.g. by tcpdump/wireshark (the same way nlmon
    works for netlink). (vsock is a framework for specific guest-host
    communication channels, used by VMware, virtio and recently also Hyper-V)