[DRE-maint] Bug#1000649: ruby-jaeger-client FTBFS on IPV6-only buildds

[Adrian Bunk]

Source: ruby-jaeger-client
Version: 1.2.0-1
Severity: serious
Tags: ftbfs
Control: block 998006 by -1

https://buildd.debian.org/status/logs.php?pkg=ruby-jaeger-client&arch=all

...
Failures:

  1) Jaeger::Encoders::ThriftEncoder without custom tags has ip
     Failure/Error: expect(ip_tag.vStr).to be_a(String)

     NoMethodError:
       undefined method `vStr' for nil:NilClass
     # ./spec/jaeger/encoders/thrift_encoder_spec.rb:40:in `block (3 levels) in <top (required)>'

Finished in 0.30993 seconds (files took 0.58969 seconds to load)
187 examples, 1 failure
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Same problem in reproducible builds:
https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ruby-jaeger-client.html