Convert datetimes for conductor instance_update.

This patch ensures that jsonutils.to_primitive() is used on the updates
being sent to conductor's instance_update method.  This is primarily so
that we convert datetimes to a string using a very specific format
defined in the timeutils module.  Then, in the conductor manager,
convert these fields back into datetime objects using timeutils.

The conversion to a string was already happening implicitly if you were
using the kombu rpc driver.  The reason is that kombu uses anyjson,
which we hook in to and will automatically use our own to_primitive()
to fix serialization problems for kombu.  Doing it explicitly is better,
and is required for the other rpc drivers to work.

This is to address a problem with sqlite where it would raise an
exception when we try to do an update to a datetime field with a string.

Fix bug 1084240.

Change-Id: I2d703a92df1e85f0f3a7a793b301fe16cbd81ff5

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