Include filename in warning about smallfiles SERVER-7430

Log message is like "info openExisting file size 16777216 but cmdLine.smallfiles=false: /data/db/filesize/dbname.0"

Signed-off-by: Ian Whalen <ian.whalen@gmail.com>
Disable test on 32-bit builds SERVER-7430

Signed-off-by: Ian Whalen <ian.whalen@gmail.com>