Send syslog to host on non-zero route domain v11.1+

Syslog is not aware of the Route Domain syntax, and since v11.1, the conversion to IPv6 no longer works.

The solution is to create a dummy Virtual Server configured on the default route domain; with the syslog server as the pool member.

Here's an example:

root@(b16b)(cfg-sync Standalone)(Active)(/Common)(tmos) list sys syslog remote-servers
sys syslog {
    remote-servers {
        remsys {
            host 10.1.1.117
        }
    }
}
root@(b16b)(cfg-sync Standalone)(Active)(/Common)(tmos) list ltm virtual syslog_vip
ltm virtual syslog_vip {
    destination 10.1.1.117:514
    mask 255.255.255.255
    pool syslog_pool
    profiles {
        fastL4 { }
    }
    snat automap
    vlans-disabled
}
root@(b16b)(cfg-sync Standalone)(Active)(/Common)(tmos) list ltm pool syslog_pool
ltm pool syslog_pool {
    members {
        172.28.4.187%1:514 {
            address 172.28.4.187%1
        }
    }
}
root@(b16b)(cfg-sync Standalone)(Active)(/Common)(tmos) list net route-domain
net route-domain 0 {
    description "Default Route Domain"
    id 0
    strict disabled
    vlans {
        internal
    }
}
net route-domain rd1 {
    id 1
    parent 0
    strict disabled
    vlans {
        external
    }
}