Commitlog replay fails when upgrade from <1.7.3 to 2.0, we need to refuse updating package if current scylla < 1.7.3 && commitlog remains. Note: We have the problem on scylla-server package, but to prevent scylla-conf package upgrade, %pretrans should be define on scylla-conf. Fixes #2551 Signed-off-by: Takuya ASADA <syuu@scylladb.com> Message-Id: <1501187555-4629-1-git-send-email-syuu@scylladb.com>