JCLOUDS-457: limit body size for specific test

For each test, we were forcing the server to discard the content of
the request body on @BeforeMethod. We need to do this on tests with a
huge body, but it may interfere with other tests which actually use
the body data.  To fix this problem, we moved the body limit
restriction to the tests that require it.

glacier/src/test/java/org/jclouds/glacier/GlacierClientMockTest.java

@@ -119,7 +119,6 @@ private static String getResponseBody(String path) throws IOException {
    @BeforeMethod
    private void initServer() throws IOException {
       server = new MockWebServer();
-      server.setBodyLimit(0);
       server.play();
       client = getGlacierClient(server.getUrl("/"));
    }
@@ -256,6 +255,8 @@ public void testUploadPart() throws InterruptedException {
    // TODO: Change size to 4096 when moving to JDK 7
    @Test
    public void testUploadPartMaxSize() throws InterruptedException {
+      // force the server to discard the request body
+      server.setBodyLimit(0);
       MockResponse mr = buildBaseResponse(204);
       mr.addHeader(GlacierHeaders.TREE_HASH, TREEHASH);
       server.enqueue(mr);