Updated the list with listed well-known communities from document IANA's https://www.iana.org/assignments/bgp-well-known-communities/bgp-well-known-communities.txt with last update date as of 2018-03-07.
- GRACEFUL_SHUTDOWN moved to 2nd entry in all lists in touched code.
- Added ACCEPT_OWN - [RFC7611]
- Added ROUTE_FILTER_TRANSLATED_v4 - currently [draft-l3vpn-legacy-rtc]
- Added ROUTE_FILTER_v4 - currently [draft-l3vpn-legacy-rtc]
- Added ROUTE_FILTER_TRANSLATED_v6 - currently [draft-l3vpn-legacy-rtc]
- Added ROUTE_FILTER_v6 - currently [draft-l3vpn-legacy-rtc]
- Added LLGR_STALE - currently [draft-uttaro-idr-bgp-persistence]
- Added NO_LLGR - currently [draft-uttaro-idr-bgp-persistence]
- Added accept-own-nexthop - currently [draft-agrewal-idr-accept-own-nexthop]
- Added BLACKHOLE - [RFC7999]
- Added NOPEER - [RFC3765]