Build failed in Jenkins: Qpid-proton-c #1839

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See <https://builds.apache.org/job/Qpid-proton-c/1839/display/redirect?page=changes>

Changes:

[aconway] PROTON-1798: [c] Fix benign race in broker.c example found by tsan

[aconway] PROTON-1798: [cpp] C++ broker example, remove unused shutdown code.

[aconway] PROTON-1798: [cpp] add library destructors for main classes

[aconway] PROTON-1798: cmake runtime-check improvements

[aconway] PROTON-1930: [cpp] Fix race condition in container_test.cpp

[aconway] PROTON-1929: [c] library prints directly to stderr/stdout

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on H25 (ubuntu xenial) in workspace <https://builds.apache.org/job/Qpid-proton-c/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url http://git-wip-us.apache.org/repos/asf/qpid-proton.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from http://git-wip-us.apache.org/repos/asf/qpid-proton.git
 > git --version # timeout=10
 > git fetch --tags --progress http://git-wip-us.apache.org/repos/asf/qpid-proton.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision 6c765bc66461c17b02ce740804f4d9e171f0fe24 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 6c765bc66461c17b02ce740804f4d9e171f0fe24
Commit message: "PROTON-1929: [c] library prints directly to stderr/stdout"
 > git rev-list --no-walk 407711aacf377a9b576adcd3f12d5f5242c4bf2a # timeout=10
[Qpid-proton-c] $ /bin/bash -e /tmp/jenkins3088911299991154613.sh
No LSB modules are available.
Arch: x86_64 Uname: Linux asf925.gq1.ygridcore.net 4.4.0-133-generic #159-Ubuntu SMP Fri Aug 10 07:31:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux lsb_release: Distributor ID: Ubuntu Description: Ubuntu 16.04.5 LTS Release: 16.04 Codename: xenial User: jenkins
=========================
Listing installed packages
cmake 3.5.1-1ubuntu3
python 2.7.12-1~16.04
ruby 1:2.3.0+1
swig3.0 3.0.8-0ubuntu3
swig 3.0.8-0ubuntu3
=========================
/usr/bin/python
/usr/bin/swig
PATH=/home/jenkins/.local/bin:/home/jenkins/tools/java/latest1.7/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
Traceback (most recent call last):
  File "/home/jenkins/.local/bin/pip", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3049, in <module>
    @_call_aside
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3033, in _call_aside
    f(*args, **kwargs)
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3062, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 660, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 673, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/home/jenkins/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 858, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==9.0.3' distribution was not found and is required by the application
Build step 'Execute shell' marked build as failure
Recording test results
ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error?

Jenkins build is back to normal : Qpid-proton-c #1840

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See <https://builds.apache.org/job/Qpid-proton-c/1840/display/redirect?page=changes>