install-dependencies: Support rhel-8.3
install-dependencies: Support rhel-8.3

The deps installer for centos also suits for rhel distro,
but it needs to get the major part from the VERSION_ID.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>
Message-Id: <20210316145506.16205-1-c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

cloudius-systems/seastar,cloudius-systems/seastar,cloudius-systems/seastar,scylladb/seastar,avikivity/seastar,avikivity/seastar,scylladb/seastar,avikivity/seastar,scylladb/seastar,syuu1228/seastar,syuu1228/seastar,syuu1228/seastar