httpbin.org down

[robert-sanfeliu]

httpbin.org seems to be down:

Apparently, it also happened recently.

This service is essential for ONM:

overlay-network-manager/network-manager/bootstrap-agent-scripts/onm/onm-bootstrap.sh

Line 179 in e69b3fe

public_ip=${4:-$(curl -s http://httpbin.org/ip | grep -oP '(?<="origin": ")[^"]*')}

Consider adding a fallback server to get the IP. Simlarly how is done at waitForMaster:

@Synchronized
def checkIPFromServers() {
    def servers = [
            "checkip.amazonaws.com",
            "api.ipify.org",
            "ifconfig.me",
            "ipinfo.io/ip",
            "icanhazip.com",
            "ident.me",
            "myip.dnsomatic.com"
    ];
    for (def server : servers) {
        def ip = retrieveIPFromServer(server)
        if (ip) {
            println "Address was retrieved from ${server}"
            println "Public IP: ${ip}"
            variables.put("masterIp", ip)
            return ip
        }
    }

    println "Unable to retrieve the public IP from any server."
}
```

Also, add error messages when this variable is not set or any of the necessary variables for the script