Fixes to gstlal-calibration-devel RPM spec

This merge request addresses an issue relating to the gstlal-calibration-devel package where python-devel was specified instead of python3-devel. I've also organized the requirements for the package into separate Requires lines.

This looks like it also addressed some CI issues we've seen in the past where we weren't able to include gstlal-calibration in the containers published to containers.ligo.org or run relevant calibration tests in the CI.

requested review from @madeline-wade

mentioned in merge request !51 (merged)

added 36 commits

• b3676bcc...d3d546c8 - 34 commits from branch master
• d6f39324 - .gitlab-ci.yml: add gstlal-calibration deps back into CI for docker/integration test stage
• 0207f4a4 - gstlal-calibration.spec.in: point at right python-devel package for python3, organize Requires

Compare with previous version

@patrick.godwin These changes look good to me. I will go ahead and merge.

merged