Quagga: bgpd needs extra neighbor and route json attributes for SNMP BGP4 MIB

Quagga: bgpd needs extra neighbor and route json attributes for SNMP BGP4 MIB

Ticket: CM-11344
Reviewed By: dwalton, dsharp
Testing Done: built and tested amd64 debs

This patch adds the peerID JSON attribute for routes for show ip bgp json.
It also corrects the bgpTimerLastWrite in show ip bgp neigh json as well
as adds bgpInUpdateElapsedTimeMsecs, lastErrorCodeSubcode, and connectRetryTimer.
These are needed for the bgp4 mib implementation (rfc 4273) from the json
output of vtysh commands.