Change I89b18709e0cfbbcbf9be96a91a13a1356cdf85b0 added new
microversion 2.37. This microversion added required field 'networks'
into create server request. By default Nova functional api tests use
samples from '/servers' directory to create a server. But now such
requests got 400 Bad Request because of missed 'networks' field.
We must handle this case if we are testing microversions >= 2.37.
This patch will add sample for microversion 2.37+
Closes-Bug: 1613998
Change-Id: I40cac263c97a4a871072d0efe5ebff295c2d917e
Sergey Nikitin