dist/debian/debian/scylla-server.upstart: export SCYLLA_CONF, SCYLLA_HOME
dist/debian/debian/scylla-server.upstart: export SCYLLA_CONF, SCYLLA_HOME

We are sourcing sysconfig file on upstart, but forgot to load them as
environment variables.
So export them.

Fixes #2236

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1491209505-32293-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

scylladb/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla