dist/debian: rename boost1.63 to scylla-boost163 on Debian 8
dist/debian: rename boost1.63 to scylla-boost163 on Debian 8

We provided "boost1.63" package for Debian 8 since we couldn't build
"scylla-boost163" package witch is available on Ubuntu14/16, but I fixed the
problem and now we have it for Debian 8 too, so switch to it.

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1514220163-25985-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

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