upgrade to libreoffice 5.2, use the one from libreoffice
upgrade to libreoffice 5.2, use the one from libreoffice

For some reason, any of the libreoffice debs packaged for ubuntu cannot
seem to open PowerPoint files. Using the debs directly from libreoffice
does work correctly. This uses those.

Change-Id: I9f38852ebca69f8df105f702f662f333ce518a39
Reviewed-on: https://gerrit.instructure.com/89260
Reviewed-by: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>
Product-Review: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>
QA-Review: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>
Tested-by: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>

instructure/dockerfiles,instructure/dockerfiles,instructure/dockerfiles,instructure/dockerfiles