Follow up on devel/py-futures port removal in r559976
The devel/py-futures port was removed in r559976 as it was for
Python 2.7 only and no longer referenced in the default cases.
However it was still defined in Mk/Uses/python.mk in PY_FUTURES,
leaving a dangling reference.
Remove it from Mk/Uses/python.mk and from affected ports, as
it was already an empty definition for Python 3.6+
Bump minimal Python version of security/theonionbox to 3.6+
sysutils/py-salt-2019: Fix build (extract) with static bsdtar(1)
===> Extracting for py37-salt-2019-2019.2.8
=> SHA256 Checksum OK for salt-2019.2.8.tar.gz.
tar: Pathname can't be converted from UTF-8 to current locale.
tar: Pathname can't be converted from UTF-8 to current locale.
tar: Pathname can't be converted from UTF-8 to current locale.
tar: Pathname can't be converted from UTF-8 to current locale.
tar: Pathname can't be converted from UTF-8 to current locale.
tar: Error exit delayed from previous errors.
===> Failed to extract "/portdistfiles//salt-2019.2.8.tar.gz".
*** Error code 1
See more details for the same issue in bug 246618.
Reported by: pkg-fallout
Approved by: portmgr blanket
Update py-salt to version 3000 and repo copy py-salt to py-salt-2019.
We decided to run both versions for a while until 2019 is EOL and give people
the possibility to run newest 3000 version.
Approved by: maintainer