dist/debian: add Conflicts with openjdk-11
dist/debian: add Conflicts with openjdk-11

Since Debian variants can install multiple JRE, "Depends: openjdk-8-jre" may
not mean default JRE is openjdk-8.
We should block openjdk-11 for now, until we support it.

Related with scylladb/scylla#5463

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <20191218113230.26383-1-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

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