bug 1549297: fix android manufacturer faceting
bug 1549297: fix android manufacturer faceting

In the signature report, one of the facets is on android manufacturer. Because
it wasn't being indexed as a keyword, it was getting tokenized and then faceted
on the tokens. This fixes that.

lonnen/socorro,mozilla/socorro,mozilla/socorro,lonnen/socorro,lonnen/socorro,mozilla/socorro,mozilla/socorro,mozilla/socorro,mozilla/socorro,lonnen/socorro