dist/ubuntu: check existance of build tools
dist/ubuntu: check existance of build tools

It normally won't be problem because scylla-tools-java usually build after scylla building.
However some tools we required for build_deb.sh doesn't installed on minimal installation, so we should check and install it.

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1483004126-2901-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

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