dist: add scylla-gdb.py on Ubuntu dbg package
dist: add scylla-gdb.py on Ubuntu dbg package

Fixes #969

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1458150248-10632-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

duarten/scylla,scylladb/scylla,scylladb/scylla,kjniemi/scylla,raphaelsc/scylla,kjniemi/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,kjniemi/scylla,raphaelsc/scylla,avikivity/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla