Changes

debian-stretch-titan: do not install unneeded dependencies

By default, Debian's package manager (apt) would install as many
dependencies as possible, including optional (recommended and
suggested) ones.

Package 'eclipse-titan' recommends 'default-jdk', which is
absolutely not needed for osmo-ttcn3-hacks, and in its turn
depends on +100500 more packages like xorg, wayland, etc.

This change significantly reduces total amount of dependencies
and the overall build time by disabling installation of
recommended and suggested dependencies.

Change-Id: I56f0d0f37e212b15e8c19ddea96d1c999177eb17