Fix "null null" user names during schema upgrade from 9 to 10
Fix "null null" user names during schema upgrade from 9 to 10

A couple of commits back we fixed the OpenID account creator to
correctly set the full_name to NULL if the first name and the
last name weren't supplied by the OpenID provider.  However, a
site may have many accounts with this name already stored in
the database.  Since null is not a very typical given name, nor
a typical family name/surname, we should be reasonably OK to do
this global search-replace on the accounts table.

Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

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