packet-ip: Add codepoint LE as per draft-ietf-tsvwg-le-phb.

From the I-D:
This document defines a Differentiated Services per-hop behavior
   [RFC2474] called "Lower Effort" (LE), which is intended for traffic
   of sufficiently low urgency that all other traffic takes precedence
   over the LE traffic in consumption of network link bandwidth
[snip]
Example uses for the LE PHB:

   o  For traffic caused by world-wide web search engines while they
      gather information from web servers.

   o  For software updates or dissemination of new releases of operating
      systems.

   o  For reporting errors or telemetry data from operating systems or
      applications.
o  For backup traffic or non-time critical synchronization or
      mirroring traffic.

   o  For content distribution transfers between caches.

   o  For preloading or prefetching objects from web sites.

   o  For network news and other "bulk mail" of the Internet.

   o  For "downgraded" traffic from some other PHB when this does not
      violate the operational objectives of the other PHB.

   o  For multicast traffic from untrusted (e.g., non-local) sources.

Change-Id: I90b2a08332943daf8349826eaa0862f0c12d6a05
Reviewed-on: https://code.wireshark.org/review/32427
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

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