[riot-notifications] [RIOT-OS/RIOT] shell/sc_gnrc_ipv6_nib: extend for ABR (#10951)

[benpicco]

I've tried the `examples/gnrc_border_router` now too.

Not sure if I'm doing this right:

```
Iface  6  HWaddr: 34:82  Channel: 26  Page: 0  NID: 0x23
          Long HWaddr: 79:7A:34:2F:9D:73:B4:82 
           TX-Power: 0dBm  State: IDLE  max. Retrans.: 3  CSMA Retries: 4 
          AUTOACK  ACK_REQ  CSMA  L2-PDU:102 MTU:1280  HL:64  RTR  
          RTR_ADV  6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::7b7a:342f:9d73:b482  scope: local  VAL
          inet6 addr: 2001:db8::7b7a:342f:9d73:b482  scope: global  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff73:b482
          
Iface  7  HWaddr: 02:F7:3F:09:66:96 
          L2-PDU:1500 MTU:1500  HL:64  RTR  
          RTR_ADV  Source address length: 6
          Link type: wired
          inet6 addr: fe80::f7:3fff:fe09:6696  scope: local  VAL
          inet6 addr: fe80::2  scope: local  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff09:6696
          inet6 group: ff02::1:ff00:2
          
> nib abr
2001:db8::7b7a:342f:9d73:b482 v0 expires 10000min
> nib abr del 2001:db8::7b7a:342f:9d73:b482
> nib abr 
[none]
> nib abr add 2001:db8::7b7a:342f:9d73:b482
address 2001:db8::7b7a:342f:9d73:b482 is not assigned to a 6LBR interface
```

The other nodes in the network get the prefix. 
```
2019-09-11 22:26:44,537 - INFO #  nib abr
2019-09-11 22:26:44,541 - INFO # 2001:db8::7b7a:342f:9d73:b482 v0 expires 9994min
```

Looks like they only get one border router though - I turned on the raspi too. (I guess that makes sense - but how do they select which to use?)

The border router is also pretty persistent: even after turning off the raspi and resetting a node, it would still have the raspi as border router - I guess there is some peer to peer exchange about neighborhood information going on? So I had to reset all nodes (or just wait a couple of weeks 😉 ) before the new border router was accepted after shutting the raspi down.


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