Return the ARP table.

def get_arp_table(self, vrf=""):
        """Return the ARP table."""
        # could use ArpTable
        # from jnpr.junos.op.phyport import ArpTable
        # and simply use it
        # but
        # we need:
        #   - filters
        #   - group by VLAN ID
        #   - hostname & TTE fields as well
        if vrf:
            msg = "VRF support has not been added for this getter on this platform."
            raise NotImplementedError(msg)

        arp_table = []

        arp_table_raw = junos_views.junos_arp_table(self.device)
        arp_table_raw.get()
        arp_table_items = arp_table_raw.items()

        for arp_table_entry in arp_table_items:
            arp_entry = {elem[0]: elem[1] for elem in arp_table_entry[1]}
            arp_entry["mac"] = napalm.base.helpers.mac(arp_entry.get("mac"))
            arp_entry["ip"] = napalm.base.helpers.ip(arp_entry.get("ip"))
            arp_table.append(arp_entry)

        return arp_table