build/repositories: do not hardcode the version of redhat-release-server rpm for RH7.
build/repositories: do not hardcode the version of redhat-release-server rpm for RH7.

enovance/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,lebauce/edeploy,lebauce/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy