Correct location of computevncconsole in -install

An XInclude resource error was being raised
when building openstack-install due to a file
being named differently than referenced via
bk_installdashboard.xml.

This fixes the reference such that it
refers to compute-vnc-console.xml,
not computevncconsole.xml.

Fixes bug 1131939.

Change-Id: Ie5751b6e63cd80894eb113ebaac161fe625a5c95