CLEANUP: opentracing: added FLT_OT_PARSE_INVALID_enum enum

It's always good to replace "hard-coded" values with something that looks
less "hard-coded" (even though that doesn't change anything in the code).
This is done here using FLT_OT_PARSE_INVALID_enum enum.

This patch must be backported as far as 2.4.
2 files changed