tests/test-issue433

Use only integer part of mtime in workingfilectx.date(), fixes test-context.py

Similar to what is done in dirstate.status() (changeset 882e703eaa94)
and has to be removed when Mercurial switches to subsecond granularity.

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue433

hg init a
cd a       
echo a > a 
hg commit -Ama 

hg parents -r 0 doesnotexist
true