build_library: rename oracle_oci image to oracle_oci_qcow
build_library: rename oracle_oci image to oracle_oci_qcow

Reserve the unsuffixed name for a raw image, in case we ever want to
support installing to disk using "coreos-install -o" on a PXE-booted
system.

glevand/coreos--scripts,coreos/scripts,glevand/coreos--scripts,coreos/scripts