This introduce offline installer generator.
It will generate self-extractable archive witch contains Scylla packages
and dependency packages.
Package installation automatically starts when the archive executed.
Limitation: Only supported CentOS at this point.
Fixes#2268
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <1491997091-15323-1-git-send-email-syuu@scylladb.com>