Remove novnc from vncproxy packages list for Ubuntu

Package resources can no longer have array for name since Puppet 3.4.

Since the package nova-novncproxy already requires novnc,
we can safely remove it from the list of packages to install.

Closes-bug: #1263293
Change-Id: Iba7ff0b7aedd750a54d931e0e8cbe37418ed6aed
(cherry picked from commit d4a8c904b775114a10edf5b1a696d6fcbf50e924)
Fix vncproxy package/service name on Debian

This commit fix vncproxy on debian os, we have now a duplicate
between nova::vncproxy and nova::spicehtml5proxy packages on debian
but install both have no sense…

Closes-bug: #1267645

Change-Id: Ib0a769ba91221d1ebc14df01f24579c8fe58db26
(cherry picked from commit c5eb65b0ad498eff4928d95e2dba31807844b5c0)