CLOUDSTACK-5857: for some reasons, delete secondary pool failed during copy template from secondary storage to primary storage, but the volume is already copied to primary storage, we didn't clean up the volume on primary storage, then all the following copy the same template to primary storage failed, as we are always using the same uuid when creating a new volume, libvirt complaining that the volume already exists.
Current fix is ignoring "the delete secondary storage error".
fix devcloud: user template's guest os type is changed