Upgrade to ExaBGP version 3.4.19.

Pkgsrc changes:
 * Adapt PLIST
 * Adapt Makefile to new python scripts

Upstream changes:

3.4.19 ExaBGP 'LINX 97/43' release
======
 * Add: IPv6 nlri-mpls to list of enabled protocol (was missing)
   requested by: adrian62
 * Fix: encoding of Flow Label requiring more than 2 bytes
   reported by: BLAKEMMM
 * Fix: decoding of capability (was potentially over reading)
 * Fix: trace when trying to access PID file and this is not allowed
   reported by: George Shuklin
 * Fix: Remove a peer's RIB cache when it is deleted from the config file
   patch by: Brian Johnson
 * Fix: do not crash the reactor when an invalid IP is passed via the API
   reported by: Yevgeniy Ovsyannikov
 * Fix: bad defintion of Flow for ICMPType, ICMPCode and Fragment
   reported by: Christoph Loibl
 * Feature: allow add-path for mpls-vpn
   reported by: adrian62
 * Change: Backported setup.py from master
 * Feature: added SRPMS for exabgp
   patch by: Leonardo Amaral

3.4.18 ExaBGP 'No BETT' release
======
 * Backport: backhole community (RFC 7999)
   original patch by: Job Snijders
 * Fix: Configuration parser does not accept configs without neighbors.
   patch by doddt
 * Fix: 'connect' keyword is now also allowed in neighbor scope
   patch by: Stacey Sheldon (Corsa)
 * Fix: removing protocol auto-cleanup (it should never be called
   and seems to cause a CG issue)
   reported by: Colin Petrie
 * Change: default to a 0 offset for ipv6 flowspec source/destination match
   patch by: Brian Johnson
 * Fix: Better PID file handling
   reported by: Ben Agricola
 * Fix: Update RIB cache families on configuration reload
   patch by: Brian Johnson
 * Fix: Backport fix on SIGUSR2 (restarting process not needing to be)
   patch by: Shawn Zhou
 * Change: group-updates now generates one UPDATE per address family
   (and not one per NLRI for non IPv4)
   patch by: Brian Johnson

3.4.17 ExaBGP 'No EPF' release
======
 * Fix: does not accept IPv6 as router-id
   reported by: yuriya
 * Fix: JSON output for flow routes with rd
   reported by droon5
 * Fix: Fix Path-Information
 * Fix: Bad encoding of capability when multiple families are used for add-path
   reported: by Alexander Bespalov
 * Fix: support non ASN4 use of AS_TRANS (AS23456)
   reported by: Todd Crane
 * Fix: do not exit when we can not accept incoming connection
   reported by: Pavel Batkov
 * Fix: quote where not escaped in JSON reason field
   reported by: Rob Barnes
 * Fix: decoding of IPv6 flow routes
   reported by: stoffi92
 * Fix: decoding of Graceful Restart Capability
   patch by: florinz
 * Fix: ASN4 encoding
   patch by: Shu Sugimoto and Eiichiro Watanabe
 * Change: Run without even peers configured
   patch by: Jordan Gedney
 * Fix: JSON encoding of updates without NLRIs
   patch by: Dhammika Pathirana
 * Fix: Possible race conditions in api handling
   patch by: Brian Johnson
 * Feature: Add 'show neighbor status' api
   patch by: Brian Johnson
 * Fix: flush route api
   patch by: Brian Johnson
 * Fix: Allow asn4 peer to speak with asn2 only peer
   patch by: Brian Johnson
 * Fix: only one MP NLRI is allow per UPDATE
   reported by: subsecond
 * Change: configuration output does not includes ':' anymore
   patch by: doddt
 * Change: syslog format changed to be in line with other application
   patch by: Brian Johnson

3.4.16 ExaBGP 'Free YouTube' release
======
A bug fix only release

 * Feature: allow users to decide if processes must be run before
   or after we drop privileges
   requested by: Ben Agricola
 * Fix: correctly look in /etc/exabgp for programs to run when
   the path is relative
   reported by: Vincent Bernat
 * Fix: missing handler for NOTIFICATION
   patch by: minglvyy

3.4.15 ExaBGP 'skip' release
======
Do not look for 3.4.14 - it was never released. An issue with pypi
forced us to skip this version.

 * Fix: the ttl-security parameter didn't really work. Fixed for
   outgoing connections now.
   patch by: Borja Marcos
 * Fix: configuration leak between processes for neighbor-changes
   and send-packets.
   reported by: spakka
 * Feature: add per neighbor connection port.
   requested by: dbarrosop
 * Fix: ASN4 boundary off by one
 * Fix: Bad peer IP when using show routes.
   patch by (backported): Wayne Tucker
 * Fix: Missing next-hop in the text api.
   reported by: Lisa Roach
 * Fix: broken route-refresh command.
   reported by: Bryan Schwerer
 * Fix: wrongly announcing connection issue with peer on the API.
   reported by: Bryan Schwerer

3.4.13 ExaBGP 'Madrid' release
======
 * Fix: add semicolon in syslog entry so it can be parsed by tools
 * Fix: duplication of message following helper process death
   reported by: spakka
 * Fix: death of helper program would lead to BGP session drop
   reported by: spakka
 * Fix: mistakenly made a function private breaking some ASN4 code path
   reported by: Victor Sudakov
 * Feature: manual eor
   patch by: Charles Ng

3.4.12 ExaBGP 'John Glenn' release
======
 * Fix: issue with unknown capabilities
   reported by: Sandy Breeze
 * Fix: notification messages were not passed to the API
   reported by: Florian Obser
 * Fix: transitivity on extended community
   patch by: Thomas Morin
 * Fix: bad reporting of VPLS information in JSON
 * Fix: wrong SAFI on MPLS routes
   reported by: Hideaki HAYASHI
 * Fix: bad route comparaison
   reported by: Alvaro Pereira
 * Fix: decoding of Update
 * Fix: Flow redirect to nexhop encoding
   reported by: Mickael Marchand (Thank you to Peng Xiao and Nicolas
   Fevrier for their help)
 * Fix/Improve: JSON for flow spec
 * Fix/Improve: redirect-to-nexthop
   reported by: Mickael Marchand

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