CF-560 Volume migration for non-root user
CF-560 Volume migration for non-root user

Volume migration failed for non-root user because it was unable to
find volume object on NFS share. This patch resolves the problem by
running `find` command with elevated privileges.

MirantisWorkloadMobility/CloudFerry,SVilgelm/CloudFerry,SVilgelm/CloudFerry,SVilgelm/CloudFerry,MirantisWorkloadMobility/CloudFerry,MirantisWorkloadMobility/CloudFerry,MirantisWorkloadMobility/CloudFerry,SVilgelm/CloudFerry