dist/redhat: force xz compression on rpm binary payload
dist/redhat: force xz compression on rpm binary payload

Same as https://github.com/scylladb/scylla/commit/301c835cbfb0596f0df1db4ef444ac8eb3af5a2e,
Fedora 31 switched the default compression to zstd, which isn't readable
by some older rpm distributions (CentOS 7 in particular). Tell it to use
the older xz compression instead, so packages produced on Fedora 31 can
be installed on older distributions.

See: https://github.com/scylladb/scylla/pull/5310

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <20191210191330.108696-1-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java,scylladb/scylla-tools-java