nagios / client: fix ip address for batcave01 vpn endpoint
    
    We used the 192.168.20 network while migrating from phx2 to iad2, but we
    no longer should be using it anywhere. Change it to 192.168.1.41, which
    is the current correct ip
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>