(7.2.z) WFTC-60 - SubordinateXAResource#getRemainingTime is not calculating the remaining time correctly

The current calculation of the remaining time for a SubordinateXAResource is incorrect because it is assuming that the elapsed time is in microseconds when it is in nanoseconds.

The current calculation is done using:

  int getRemainingTime() {
        long elapsed = max(0L, System.nanoTime() - startTime);
        final int capturedTimeout = this.capturedTimeout;
        return capturedTimeout - (int) min(capturedTimeout, elapsed / 1_000_000L);
    }

However, System.nanoTime() is in nanoseconds, so we have to divide by 1_000_000_000L in order to get seconds to compare with the capturedTimeout.

Since WFTC-54, an exception is thrown if the remaining timeout is up, which is affecting one of the tests in wildfly, see WFLY-11670 for more information.