Switch compute flavors from novaclient/direct to SDK

Let's switch flavors from novaclient or direct API requests onto using
SDK. Microversion agreement comes out of the box.

SDK normalizes property names, while OSC uses server side names. In
order not to break OSC users continue using server-side names.

Depends-On: https://review.opendev.org/#/c/762989/
Change-Id: I62b2ed8488ee4ac9c42051311bcfb455506ddd90

Author: gtema

lower-constraints.txt

@@ -45,7 +45,7 @@ msgpack-python==0.4.0
 munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
-openstacksdk==0.51.0
+openstacksdk==0.52.0
 os-service-types==1.7.0
 os-testr==1.0.0
 osc-lib==2.2.0