[Bug 1930772] Re: currently FTBFS due to TestTLSConfig

[William Wilson]

This patch cherry picks a minor upstream change to enable building with
golang 1.16.

** Patch added: "lp1930772.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/golang-github-prometheus-common/+bug/1930772/+attachment/5506526/+files/lp1930772.debdiff

** Changed in: golang-github-prometheus-common (Ubuntu)
       Status: In Progress => Fix Committed

** Bug watch added: Debian Bug tracker #990241
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990241

** Also affects: golang-github-prometheus-common (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990241
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1930772

Title:
  currently FTBFS due to TestTLSConfig

Status in golang-github-prometheus-common package in Ubuntu:
  Fix Committed
Status in golang-github-prometheus-common package in Debian:
  Unknown

Bug description:
  golang-github-prometheus-common package currently FTBFS due to
  TestTLSConfig

  === RUN   TestTLSConfig
  http_config_test.go:519: Unexpected TLS Config result:

  [...]
  RootCAs:0xc00011d470
  [...]
           expected                                                                                                                    
  [...]
  RootCAs:0xc00011cf30
  [...]
  -- FAIL: TestTLSConfig (0.00s) 

  This is reported upstream at https://github.com/prometheus/common/issues/267
  This is also already fixed in commit 10e1378a4a94394e5671c529b7d87833c2b70d13

  This also appears to be related to go 1.16 - previous versions of go appear to                                                       not trigger the issue (or so I infer from the upstream bug report).                                                                  
                                                                                                                                       
  Filing the bug largely to track this as a known issue and mark it in the                                                             
  update-excuses report.  Should be resolved when a new version is uploaded, or                                                        
  the above fix could be cherry-picked if someone is so inclined.

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