Refactor CSV generation code to utils

Moving general CSV generation code from usage into utils so that it can be
used by other dashboards.

The file is named csvbase to avoid name collisions with csv module.

Change-Id: I3f4a573b53cb2d85fa36e84320707d74917498ad
Closes-bug: #1280475
Use unminified javascript files

    In Debian, minified javascript are considered either as an
obfuscation of the original code, or as a "compiled-in binary"
version of them, and therefore minified javascript files are
considered non-free.

    Moreover, the use of unminified javascript will ease the
development on client side. There will be no impact on Horizon
performance due to the compress tag of Django.

Change-Id: I8f6eee651fe1096cc7262ef92d614c716d2e9b55
backport: havana
Closes-Bug: #1269727
Merge "Refactor CSV generation code to utils"
Merge "Use unminified javascript files"