Install requirements for plain centos7 to build centos7 VM

opennebula-images/centos7-build-luks-opennebula-image.sh

@@ -60,6 +60,9 @@ if [ ! -f '/etc/centos-release' ]; then
 	sleep 5
 fi
 
+# Install requirements
+yum install -y qemu cryptsetup
+
 # Create base RAW image (no LOOPBACK support in RHEL/CentOS).
 qemu-img create -f raw "$IMAGE_PATH" "$IMAGE_SIZE"
 losetup "$LOOPBACK_DEVICE" "$IMAGE_PATH"