Travis-CI Fixes
Travis-CI Fixes

This patch ensures that Bintray deployments are not attempted for builds
that are running to specifically produce Docker plug-in images. This
patch also updates the list of dependency packages installed as the
requirements to run `alien` seem to now include `debhelper`, `dpkg`, and
`dpkg-dev`.

cduchesne/rexray,thecodeteam/rexray,akutz/rexray,codedellemc/rexray,codedellemc/rexray,akutz/rexray,emccode/rexray,oppodeldoc/rexray,thecodeteam/rexray,emccode/rexray,akutz/rexray,thecodeteam/rexray,oppodeldoc/rexray,codedellemc/rexray,oppodeldoc/rexray,akutz/rexray,cduchesne/rexray,codedellemc/rexray,thecodeteam/rexray,cduchesne/rexray,akutz/rexray,emccode/rexray,emccode/rexray,akutz/rexray,cduchesne/rexray,codedellemc/rexray,oppodeldoc/rexray,oppodeldoc/rexray,oppodeldoc/rexray,thecodeteam/rexray,thecodeteam/rexray,codedellemc/rexray,cduchesne/rexray,cduchesne/rexray