Test server create with ephemeral disk

This patch creates new flavor, which includes ephemeral disk.
Then ssh into the instance to get partition information. We can't
get partition device name , this depends on image. So we compare
the number of partitions to confirm ephemeral disk is created.

Change-Id: I3183746cf35b2acbf443a0b52b211982758bcf87
Merge "Test server create with ephemeral disk"