[MacPorts] #56040: Move some checks out of lint --nitpick

[MacPorts]

#56040: Move some checks out of lint --nitpick
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 Reporter:  l2dy         |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 https://github.com/macports/macports-ports/pull/187#issuecomment-275543295

 >Isn't the point of port lint --nitpick that these additional checks are
 not mandatory? If we start asking to adhere to them we could just enable
 them all by default.

 Some checks e.g. trailing whitespaces and missing newline at end of file
 should be mandatory.

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Ticket URL: <https://trac.macports.org/ticket/56040>
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