MND-3: Fix table rendering for certain browsers.

This patch addresses the wrong table rendering in certain web browsers
(JIRA MND-3: https://midonet.atlassian.net/browse/MND-3).

The solution is to define a default table width via DocBook's
"default.table.width" parameter (set to "100%" in this patch).

References:
http://docbkx-tools.sourceforge.net/docbkx-maven-plugin/generate-html-mojo.html#defaultTableWidth
http://docbook.sourceforge.net/release/xsl/1.78.1/doc/html/default.table.width.html

Change-Id: I651b094028204922e69d9f7a969cdd67e440d4f5
Signed-off-by: Jan Hilberath <jan@midokura.com>
Merge "MND-3: Fix table rendering for certain browsers."