[swss]: Update the ipinip.j2 template to specify the IPv4 loopback address

[stcheng]

output:

root@str-s6000-on-2:/# sonic-cfggen -m /etc/sonic/minigraph.xml -d -v "LOOPBACK_INTERFACE.keys()"

[('Loopback0', '200A:0100::20/128'), ('Loopback0', '10.1.0.32/32')]

[                                              
    {                                          
        "TUNNEL_DECAP_TABLE:IPINIP_TUNNEL" : { 
            "tunnel_type":"IPINIP",            
            "src_ip":"10.1.0.32",              
            "dst_ip":"10.1.0.32",              
            "dscp_mode":"pipe",                
            "ecn_mode":"copy_from_outer",      
            "ttl_mode":"pipe"                  
        },                                     
        "OP": "SET"                            
    }                                          
]                                              

[taoyl-ms]

Just a comment - Please note that this will fail when there will be multiple ipv4 lo addresses.
Not sure if that is a scenario we are going to support though.

[stcheng]

Yes. It will also fail if there's no IPv4 address assigned to the loopback interface.

[stcheng]

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            ^""""""""^     `Y88888888888888888888,    888888888888888P'
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                                "Y8888888888888888P     `""""^
                                  `"YY88888888888P'
                                       ^""""""""'

[lguohan]

yes, we do have two ipv4 loopback address scenario.

[svc-acs]

Build triggered. sha1 is merged.

[stcheng]

it seems that the source IP is not used. we're not encapsulating packets. we will need to remove that part later.