[MacPorts] #59287: Include the portwatcher build number in the portbuilder priority

[MacPorts]

#59287: Include the portwatcher build number in the portbuilder priority
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 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 As a result of #52766, `getSchedulersAndProperties` assigns a priority to
 each portbuilder build, which `getPriority` interprets an integer,
 representing the order in which portbuilder builds should happen for this
 portwatcher build.

 The problem is that due to #53587 we sometimes start another portwatcher
 before we're supposed to. Then the portbuilder builds for each of the
 portwatchers are mingled together, which isn't particularly correct.

 A quick way to make this situation better would be to modify the priority
 field to be interpreted as a version number instead of an integer,
 assuming that python has version number comparison support. Then if
 portwatcher build 42 triggers 2 portbuilder builds, their priorities would
 be "42.1" and "42.2".

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Ticket URL: <https://trac.macports.org/ticket/59287>
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