pkg/51433: Cannot install binary packages from ftp.netbsd.org

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>Number:         51433
>Category:       pkg
>Synopsis:       Cannot install binary packages from ftp.netbsd.org
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 21 15:55:00 +0000 2016
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.35 amd64
>Organization:
>Environment:
NetBSD chieftec 7.99.35 NetBSD 7.99.35 (GENERIC) #0: Sat Aug 13 20:08:49 CEST 2016  root@chieftec:/tmp/netbsd-tmp/sys/arch/amd64/compile/GENERIC amd64
>Description:
There is an issue with attempt to install binary packages from ftp.netbsd.org site. Files aren't able to be installed due to "File unavailable (e.g., file busy)"

$ pkg_add ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/7.0_2016Q2/All/pkgin-0.9.4nb2.tgz 
pkg_add: Warning: package `pkgin-0.9.4nb2' was built for a platform:
pkg_add: NetBSD/x86_64 7.0 (pkg) vs. NetBSD/x86_64 7.99.35 (this host)
pkg_add: Can't process ftp://ftp.netbsd.org:21/pub/pkgsrc/packages/NetBSD/amd64/7.0_2016Q2/All/pkg*: File unavailable (e.g., file busy)
pkg_add: Can't process ftp://ftp.netbsd.org:21/pub/pkgsrc/packages/NetBSD/amd64/7.0_2016Q2/All/pkg*: File unavailable (e.g., file busy)
pkg_add: no pkg found for 'pkg_install>=20130901', sorry.
pkg_add: Can't install dependency pkg_install>=20130901
pkg_add: 1 package addition failed
>How-To-Repeat:
$ pkg_add ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/7.0_2016Q2/All/pkgin-0.9.4nb2.tgz 
>Fix:
N/A