Minor fix: Delete obsolete code in nova_compute
Minor fix: Delete obsolete code in nova_compute

Since now we have keypairs migration implemented in the different
specific task, we do not need to collect information about them
in the compute resource anymore.

MirantisWorkloadMobility/CloudFerry,MirantisWorkloadMobility/CloudFerry,archyufa/CloudFerry,SVilgelm/CloudFerry,japaniel/CloudFerry,mgrygoriev/CloudFerry,mgrygoriev/CloudFerry,andybondar/CloudFerry,mgrygoriev/CloudFerry,japaniel/CloudFerry,roman-verchikov/CloudFerry,mgrygoriev/CloudFerry,japaniel/CloudFerry,archyufa/CloudFerry,archyufa/CloudFerry,andybondar/CloudFerry,SVilgelm/CloudFerry,Settis/CloudFerry,SVilgelm/CloudFerry,roman-verchikov/CloudFerry,MirantisWorkloadMobility/CloudFerry,japaniel/CloudFerry,andybondar/CloudFerry,roman-verchikov/CloudFerry,SVilgelm/CloudFerry,archyufa/CloudFerry,MirantisWorkloadMobility/CloudFerry,andybondar/CloudFerry,roman-verchikov/CloudFerry