[MacPorts] #33820: base: add ui_msg to output outdated ports during selfupdate

[MacPorts]

#33820: base: add ui_msg to output outdated ports during selfupdate
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 Reporter:  sean.michael.farley@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement                    |      Status:  new                                  
 Priority:  Normal                         |   Milestone:                                       
Component:  base                           |     Version:  2.0.4                                
 Keywords:                                 |        Port:                                       
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 This is a small tweak to macports base that will output the outdated ports
 after showing the message:

 "The ports tree has been updated. To upgrade your installed ports, you
 should run
   port upgrade outdated"

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Ticket URL: <https://trac.macports.org/ticket/33820>
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