Switch queries to ANDing terms together.

This is more standard for search engines but can lead to times where the
user gets too few results because they were too specific.  It is also
the default behavior of lsearchd.

Bug: 52904

Change-Id: Ia6603302afd00317366301663f4e5d24d1f4de4f
Merge "Switch queries to ANDing terms together."