[MacPorts] #44484: Harmonize database variants

[MacPorts]

#44484: Harmonize database variants
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  Reporter:  ctreleaven@…  |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.1
Resolution:                |   Keywords:
      Port:  p5-dbd-mysql  |
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Comment (by hassy.6thsense@…):

 "mysql5" rename to "mysql51" and if "mysql5" is selected, replaced with
 "mysql51".[[BR]]
 "mariadb" rename to "mariadb55".[[BR]]
 "percona" rename to "percona55".[[BR]]
 Default variant Changed to "mariadb55".[[BR]]
 Added "mysql56".

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Ticket URL: <https://trac.macports.org/ticket/44484#comment:2>
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