[MacPorts] #72422: bash-completion: add latest macports commands/options, particularly 'port snapshot'

[MacPorts]

#72422: bash-completion: add latest macports commands/options, particularly 'port
snapshot'
---------------------+-----------------------------
 Reporter:  mascguy  |      Owner:  raimue
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.10.6
 Keywords:           |       Port:  bash-completion
---------------------+-----------------------------
 Perhaps the only thing missing is completions for `port snapshot`, but
 they are slightly behind the latest MacPorts releases.

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Ticket URL: <https://trac.macports.org/ticket/72422>
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