code: function cleanup_manta(_cb) {
          self.manta.unlink(manta.path(p, true), function (m_err) {
              if (m_err) {
                  // An ENOENT is ok since that means the file doesn't
                  // exist in manta. This can happen if we create and delete a
                  // file before we ever write it back.
                  if (m_err.code === 'ENOENT') {
                      log.trace('del(%s): done', p);
                      _cb(null);
                  } else {
                      if (m_err.code === 'ENOTEMPTY') {
                          log.info('del(%s): directory not empty', p);
                      } else {
                          log.error(m_err, 'del(%s): failed', p);
                      }
                      _cb(m_err);
                  }
              } else {
                  log.trace('del(%s): done', p);
                  _cb(null);
              }
          });
      }
docs: remove from manta