Make the build reproducible

[lamby]

Whilst working on the Reproducible Builds effort [0], we noticed
that gnocchi could not be built reproducibly as it iterates over
a Python set when generating documentation.

This was originally filed in Debian as #892419.

[0] https://reproducible-builds.org/
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892419

Signed-off-by: Chris Lamb lamby@debian.org

[ghost]

Tests FAILURE for HEAD 87928a7

• TARGET=pep8: PASSED ✅
• TARGET=docs: PASSED ✅
• TARGET=docs-gnocchi.xyz: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.0: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.0: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.1: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.1: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.2: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.2: PASSED ✅
• TARGET=py27-mysql: FAILED ❌
• TARGET=py35-mysql: PASSED ✅
• TARGET=py27-postgresql: PASSED ✅
• TARGET=py35-postgresql: PASSED ✅

[ghost]

Tests SUCCESS for HEAD 87928a7

• TARGET=pep8: PASSED ✅
• TARGET=docs: PASSED ✅
• TARGET=docs-gnocchi.xyz: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.0: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.0: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.1: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.1: PASSED ✅
• TARGET=py27-mysql-ceph-upgrade-from-4.2: PASSED ✅
• TARGET=py35-postgresql-file-upgrade-from-4.2: PASSED ✅
• TARGET=py27-mysql: PASSED ✅
• TARGET=py35-mysql: PASSED ✅
• TARGET=py27-postgresql: PASSED ✅
• TARGET=py35-postgresql: PASSED ✅

[lamby]

Thanks!