Enable B2 testCopy* tests

Backblaze has changed something such that these now pass.
diff --git a/providers/b2/src/test/java/org/jclouds/b2/blobstore/integration/B2BlobIntegrationLiveTest.java b/providers/b2/src/test/java/org/jclouds/b2/blobstore/integration/B2BlobIntegrationLiveTest.java
index 93fc8f1..0ecb6bd 100644
--- a/providers/b2/src/test/java/org/jclouds/b2/blobstore/integration/B2BlobIntegrationLiveTest.java
+++ b/providers/b2/src/test/java/org/jclouds/b2/blobstore/integration/B2BlobIntegrationLiveTest.java
@@ -65,16 +65,6 @@
    }
 
    @Override
-   public void testCopyBlobCopyMetadata() throws Exception {
-      try {
-         super.testCopyBlobCopyMetadata();
-         failBecauseExceptionWasNotThrown(IllegalArgumentException.class);
-      } catch (IllegalArgumentException iae) {
-         throw new SkipException("B2 does not support the Cache-Control header", iae);
-      }
-   }
-
-   @Override
    public void testCopyBlobReplaceMetadata() throws Exception {
       try {
          super.testCopyBlobReplaceMetadata();
@@ -85,46 +75,6 @@
    }
 
    @Override
-   public void testCopyIfMatch() throws Exception {
-      try {
-         super.testCopyIfMatch();
-         failBecauseExceptionWasNotThrown(IllegalArgumentException.class);
-      } catch (IllegalArgumentException iae) {
-         throw new SkipException("B2 does not support the Cache-Control header", iae);
-      }
-   }
-
-   @Override
-   public void testCopyIfNoneMatch() throws Exception {
-      try {
-         super.testCopyIfNoneMatch();
-         failBecauseExceptionWasNotThrown(IllegalArgumentException.class);
-      } catch (IllegalArgumentException iae) {
-         throw new SkipException("B2 does not support the Cache-Control header", iae);
-      }
-   }
-
-   @Override
-   public void testCopyIfModifiedSince() throws Exception {
-      try {
-         super.testCopyIfModifiedSince();
-         failBecauseExceptionWasNotThrown(IllegalArgumentException.class);
-      } catch (IllegalArgumentException iae) {
-         throw new SkipException("B2 does not support the Cache-Control header", iae);
-      }
-   }
-
-   @Override
-   public void testCopyIfUnmodifiedSince() throws Exception {
-      try {
-         super.testCopyIfUnmodifiedSince();
-         failBecauseExceptionWasNotThrown(IllegalArgumentException.class);
-      } catch (IllegalArgumentException iae) {
-         throw new SkipException("B2 does not support the Cache-Control header", iae);
-      }
-   }
-
-   @Override
    public void testPutObjectStream() throws InterruptedException, IOException, ExecutionException {
       throw new SkipException("B2 requires a Content-Length");
    }