pkg/55392: pkg-rolling_replace doesn't handle multiple python versions

[john%ziaspace.com@localhost]

>Number:         55392
>Category:       pkg
>Synopsis:       pkg-rolling_replace doesn't handle multiple python versions
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 16 18:35:00 +0000 2020
>Originator:     John Klos
>Release:        NetBSD 9.0_STABLE
>Organization:
	
>Environment:
	
	
System: NetBSD athena.zia.io 9.0_STABLE NetBSD 9.0_STABLE (ATHENA-$Revision: 9.0r $) #0: Tue Jun 16 16:21:20 UTC 2020 john%athena.zia.io@localhost:/home/obj-alpha/sys/arch/alpha/compile/ATHENA alpha
Architecture: alpha
Machine: alpha
>Description:
	
pkg-rolling_replace fails when python27 versions of packages are installed:

RR> Checking for mismatched installed packages using pkg_chk
rr> Installed: py37-six-1.15.0 py37-dns-1.16.0nb1 py37-cryptodome-3.9.7 py37-ecdsa-0.15
RR> Excluding the following mismatched packages:
rr> EXCLUDE=[]
RR> Checking for rebuild-requested installed packages (rebuild=YES)
RR> Checking for unsafe installed packages (unsafe_depends=YES)
RR> Building dependency graph for installed packages
RR> Tsorting dependency graph
*** pkg_chk reports the following packages need replacing, but they are not installed: py37-six

pkg_info | grep six
py27-six-1.14.0     Python 2 and 3 compatibility utilities

python27 is still needed for mailman.

>How-To-Repeat:
	
>Fix:
	

>Unformatted: