Use <div/> instead of <br/> in task results

This avoids wasting vertical space when displaying recipes
tasks that haven't started.

(cherry picked from commit 0839d3b83fa6bc6e9488a620761994744d7a1aed)

Bug: 1066122
Change-Id: Ie3ec6f99d5fd705e3fc1bb70a594e80d2de0f8a6
don't truncate watchdog time remaining to 7 characters

The '%.7s' format string had the effect of truncating off the
microsecond portion of the time remaining, however it failed to deal
with timedeltas outside the range of (0, 10 hours].

This patch avoids a microsecond portion on the time remaining, without
truncating unusual values.

Bug: 1072133
Change-Id: I4696934fc3de78d3f6e5cc57e3d71097a6d2a763