OC-9994 Knife Azure server create used with --azure-connect-to-existing-dns option assumes ssh/winrm tcp endpoints port 22/5985 already used by existing vm.

Implemented changes to use ssh/winrm port 22/5985 with --azure-connect-to-existing-dns option.
PBI details: https://tickets.corp.opscode.com/browse/OC-9994

@adamedx Please review the changes. Let me know your comments for this PBI.
Thanks.