timeout occurs.

Submitted by:	Denis Hennessy <denis@network365.com>

As a side effect, <condition> gains two new conditions.  This also
means we now have a way to check whether we are on a networked system
and run/omit testcases that require network to be established based on
such a condition.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270050 13f79535-47bb-0310-9956-ffa450edef68