New command: get information about the specific Flow's run #400

Get information about the specific Flow run

• command: azmgmt flow run get -n|--name <name> -f|--flow <flow> -e|--environment <environment>
• name: name of the run for which to get more information
• flow: The name of the Microsoft Flow for which to retrieve information
• environment: The name of the environment where the Flow is located