tests: add Fedora CI tests definition file
    
    Add very basic  server based integration tests:
     * basic connect with 2 minutes stability check
     * ipv4/ipv6
     * terminating openvpn service
     * mtu
    
    Using these tests from NM repo:
     * openvpn_ipv4
     * openvpn_ipv6
     * openvpn_set_mtu
     * openvpn_delete_active_connection
     * openvpn_persist
    
    NM repo:
     https://gitlab.freedesktop.org/NetworkManager/NetworkManager-ci/blob/master/nmcli/features/openvpn.feature