WIP: Add CC7 (Centos7) CI jobs

This MR adds new (resurrected) CC7 (Centos7) jobs to the CI pipeline

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• 2670fc4b - (CI) add Coin CC7 job

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• 36b0b5bc - (CI) add LCG setup script for CC7 jobs

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• 960fb32b - (CI) add wget to yum setup for CC7

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• d7e83d88 - (CI) Add unzip to yum for CC7 jobs

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added Continuos Integration label

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• 72ed1383 - (CI) remove cmake args from CC7 template job

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• 5a644fd4 - (CI) Add 'yum install gcc' to CC7 template job

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• c93e1a87 - (CI) add debug messages

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• 5d3ecff9 - (CI) Add 'make' to the yum packages for CC7

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• 7d3b43d1 - (CI) Add OpenGL 'freeglut' to CC7 job

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• 4e7c148d - (CI) Add SoQt build for CC7

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• 0b13d459 - (CI) Add CC7 GeoModel builds (base, tools, viz)

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• 0c3af67d - (CI) Install cmake 3.14 for CC7 jobs

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• b29a63d3 - (CI) add debug msg

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• 08af9d2c - (CI) CC7: remove cmake from yum install command, too old version

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• 6507f844 - (CI) debug msg

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• a7c344c8 - (CI) Set PATH for CC7 jobs

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• c627ba0f - (CI) Add ssl and crypto to the CC7 template

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• 97cb68f6 - (CI) clean unused variables

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• 2c5e5742 - (cmake) update finding of Xerces and Json, according to the build options

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