The qemu binaries are not linked to libgfapi. This is odd because the rest of el7 supports gfapi and even qemu-img is linked to it. A simple rebuild with glusterfs-api-devel as a builddep works to enable gfapi support.
EPEL 7 entered end-of-life (EOL) status on 2024-06-30.\n\nEPEL 7 is no longer maintained, which means that it\nwill not receive any further security or bug fix updates.\n As a result we are closing this bug.