FileLfsServlet: Do not pretty print json response

Pretty printing the response is useful for human readers, but most
(if not all) of the time, the response will be read by programs.

Remove it to avoid the additional overhead of the formatting and
extra bytes in the response. Adjust the test accordingly.

Note that LfsProtocolServlet already doesn't use pretty printing,
so this change makes FileLfsServlet's behavior consistent. In fact,
both classes now have duplicate Gson handling; this will be cleaned
up in a separate change.

Change-Id: I113a23403f9222f16e2c0ddf39461398b721d064
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.lfs.server.test/tst/org/eclipse/jgit/lfs/server/fs/DownloadTest.java

@@ -129,7 +129,7 @@ public class DownloadTest extends LfsServerTest {
 		long start = System.nanoTime();
 		long len = getContent(id, f2);
 		System.out.println(
-				MessageFormat.format("dowloaded 10 MiB random data in {0}ms",
+				MessageFormat.format("downloaded 10 MiB random data in {0}ms",
 						(System.nanoTime() - start) / 1e6));
 		assertEquals(expectedLen, len);
 		FileUtils.delete(f.toFile(), FileUtils.RETRY);
@@ -138,7 +138,7 @@ public class DownloadTest extends LfsServerTest {
 
 	@SuppressWarnings("boxing")
 	private String formatErrorMessage(int status, String message) {
-		return String.format("Status: %d {\n  \"message\": \"%s\"\n}", status,
+		return String.format("Status: %d {\"message\":\"%s\"}", status,
 				message);
 	}
 }

org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/FileLfsServlet.java

@@ -211,10 +211,9 @@ public class FileLfsServlet extends HttpServlet {
 	}
 
 	private static Gson createGson() {
-		GsonBuilder gb = new GsonBuilder()
+		return new GsonBuilder()
-				.setFieldNamingPolicy(
+				.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
-						FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
+				.disableHtmlEscaping()
-				.setPrettyPrinting().disableHtmlEscaping();
+				.create();
-		return gb.create();
 	}
 }