Fedora: Update required RPMs for Fedora 31

This includes the addition of the python3-virtualenv package required to
provide the virtualenv binary that is no longer present in the image.

Change-Id: Ie8e66d8b9f93063b97f88f41a626daddf235339b
diff --git a/files/rpms/cinder b/files/rpms/cinder
index e1e1f6c..a8201ea 100644
--- a/files/rpms/cinder
+++ b/files/rpms/cinder
@@ -1,5 +1,5 @@
 iscsi-initiator-utils
 lvm2
 qemu-img
-scsi-target-utils # not:rhel7,f30 NOPRIME
-targetcli # dist:rhel7,f30 NOPRIME
+scsi-target-utils # not:rhel7,f30,f31 NOPRIME
+targetcli # dist:rhel7,f30,f31 NOPRIME