Currently scylla_setup is unusable when user does not want to install scylla-jmx because it checks package unconditionally, but some users (or developers) does not want to install it, so let's ask to skip check or not on interactive prompt. Also, scylla-tools package should installed for most of the case, added check code for the package. Signed-off-by: Takuya ASADA <syuu@scylladb.com> Message-Id: <1460662354-10221-1-git-send-email-syuu@scylladb.com>