CentOS7 CI

Create a CI job for running the unit tests and integration tests on
CentOS7.

Change log:
* Fix Documentation path
* Ci job for CentOS7
6 jobs for 97-centos-ci in 17 minutes and 10 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Static Analysis
passed Format #5813
docker

00:00:43

passed Lint #5814
docker

00:05:58

 
  Build
passed Documentation #5815
docker

00:02:23

 
  Test
passed Authorisation Disabled #5817
docker

00:02:35

passed Default #5816
docker

00:02:53

passed centos7 #5818
docker

00:02:36