update of testcase_32_ephemeral

[vex21]

We'll have to update this test because it seems that Amazon started to pre-format ephemeral devices (now called Instance Store devices) to ext3, while the test in question expects the block device to be empty.

Before the test is adjusted, we'll have to explore whether this change in Instance Store devices is limited to certain regions, or possibly RHEL versions, or whether it is system-wide.