Add test framework for bmpblk_utility.

BUG=chromium-os:11742
TEST=manual

Check out sources, run:

  cd src/platform/vboot_reference
  make
  make runbmptests

It should pass.

Change-Id: I50ebdef26662e7446828315a3f5e2786624508b9

Review URL: http://codereview.chromium.org/6246150
diff --git a/utility/bmpblk_utility.cc b/utility/bmpblk_utility.cc
index 8da3e18..a87761c 100644
--- a/utility/bmpblk_utility.cc
+++ b/utility/bmpblk_utility.cc
@@ -338,7 +338,7 @@
         it->second.data.height = get_bmp_image_height(it->second.raw_content);
         break;
       default:
-        error("Unsupported image format.");
+        error("Unsupported image format.\n");
     }
   }
 }
@@ -355,7 +355,7 @@
       }
       break;
     default:
-      error("Unsupported data compression.");
+      error("Unsupported data compression.\n");
   }
 }