trivial: fix some incorrect compute microversion references
trivial: fix some incorrect compute microversion references

This patchset fixes some incorrect compute microversion references.

2.54: should have id 49 (was 4)
2.55: should have id 50 (was 49)
2.57: should have id 52 (was 51)

Change-Id: I81d90637fe16e1d5de1e26f50a86f9ff83d355ca

masayukig/tempest,openstack/tempest,masayukig/tempest,cisco-openstack/tempest,cisco-openstack/tempest,openstack/tempest