add nfs_exports_config and others

Fixes error: The task includes an option with an undefined variable. The error was: 'nfs_exports_config' is undefined\n\nThe error appears to have been in '/tmp/ocp-ha-lab-7bfe/ansible_agnostic_deployer/ansible/roles/host-ocp-nfs/tasks/nfs_exports.yml': line 21, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: create exports file\n  ^ here\n"}