Use lower value to create flavor for creating server

Running test_resize_server_using_overlimit_vcpus will sometimes
fail with "No valid host was found", because the values it uses
for disk/ram/vcpus are a little too large(especially vcpus value),
the environment may don't meet the resource requirement.
This is to use lower value to create flavor to avoid "No valid host
was found" exception.

Change-Id: I6201333f8d288a4f704971643607e19173165b36
1 file changed