rgw: remove clutter

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: multipart meta object shouldn't be versioned

This object is already unique due to the upload id associated with it.

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: limit print length of bufferlist buffer

These specific buffers are not null terminated.

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>