OC-10521  knife-cloud: knife openstack should support summary display during create and new command

Implemented changes to display server summary during server create command.
Added rspec tests.
PBI ref: https://tickets.corp.opscode.com/browse/OC-10521
PR opens on base branch: https://github.com/ClogenyTechnologies/knife-cloud/tree/ameya-oc-10520-server-show

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