Move microversion config options to 'compute' section

Currently microversion config options (min_microversion, max_microversion)
are under 'compute-feature-enabled' section. But that sections is
only for boolean flags.

This commit move those options under 'compute' section and makes
older section options as deprecated with new one.

Partially implements blueprint api-microversions-testing-support

Change-Id: I29f0cb9962fdaaecf60a886467c4665fe4010353
3 files changed