[OC][Docker][RHEL8] Initial Support

cmake_targets/build_oai

cmake_targets/tools/build_helper

docker/Dockerfile.eNB.rhel7.oc4-4

docker/Dockerfile.gNB.rhel7.oc4-4

docker/Dockerfile.ran.rhel7.oc4-4

openshift/oai-enb-build-config.yml

openshift/oai-enb-image-stream.yml

openshift/oai-gnb-build-config.yml

openshift/oai-gnb-image-stream.yml

openshift/oai-ran-build-config.yml

openshift/oai-ran-image-stream.yml

openshift/oc_init_enb.sh

openshift/oc_init_gnb.sh

openshift/oc_init_ran.sh