bgpd: Format properly `show bgp neighbors` for graceful restart stuff

bgpd: Format properly `show bgp neighbors` for graceful restart stuff

Before:

```
  Graceful restart informations:
    End-of-RIB send: IPv4 Unicast
    End-of-RIB received: IPv4 Unicast
    Local GR Mode  : Helper*
    Remote GR Mode : Helper
    R bit          : False
    Timers :
     Configured Restart Time(sec)  : 120
     Received Restart Time(sec)    : 120
    IPv4 Unicast :
     F bit                 : False
     End-of-RIB Received   : Yes
     End-of-RIB Send       : Yes
     EoRSentAfterUpdate   : Yes
     Timers:
      Configured Stale Path Time(sec)        : 360
```

After:

```
  Graceful restart informations:
    End-of-RIB send: IPv4 Unicast
    End-of-RIB received: IPv4 Unicast
    Local GR Mode: Helper*
    Remote GR Mode: Helper
    R bit: False
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 120
    IPv4 Unicast:
      F bit: False
      End-of-RIB sent: Yes
      End-of-RIB sent after update: Yes
      End-of-RIB received: Yes
      Timers:
        Configured Stale Path Time(sec): 360
```

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>