[Swiftstack] Add plugin-specific roles: Swiftstack data node and Swiftstack controller

If you'd like the plugin to deploy Swiftstack data nodes (not the way it's done now, because the plugin doesn't not install anything in the current version), then you'll need to introduce plugin-specific role.
Instructions can be found: here:https://wiki.openstack.org/wiki/Fuel/Plugins#Configuration_of_Fuel_Plugins_with_new_roles

the plugin-specific role (e.g. Swiftstack data node) should incorporate the following steps:
install ubuntu
configure logical Fuel networks for all interfaces
create disk partitions
install Swiftstack itself (rewrite in puppet):
curl https://platform.swiftstack.com/install
install_failure() { echo "Installation requires $1"; exit 1; }
test "$(uname -i)" == "x86_64" || install_failure "a 64-bit (x86_64) kernel (found '$(uname -i)')"
test -f /etc/lsb-release && . /etc/lsb-release
test "$DISTRIB_RELEASE" == "12.04" -o "$DISTRIB_RELEASE" == "14.04" || install_failure "Ubuntu 12.04 or 14.04 (found $DISTRIB_DESCRIPTION)"
curl https://platform.swiftstack.com/apt_repo/apt_key.pub | sudo apt-key add - || exit 1
sudo sh -c "echo deb https://platform.swiftstack.com/apt_repo $DISTRIB_CODENAME swiftstack > /etc/apt/sources.list.d/ssman.list"
sudo apt-get update && sudo apt-get install -y swiftstack-node < /dev/null || exit 1
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