zulip-puppet-apply: Fix flushing of stdout for Python 3.
zulip-puppet-apply: Fix flushing of stdout for Python 3.

Apparently, this UI worked just fine with Python 2, but failed to
actually print usefully with Python 3.

zulip/zulip,brainwane/zulip,andersk/zulip,jackrzhang/zulip,rishig/zulip,hackerkid/zulip,shubhamdhama/zulip,showell/zulip,jackrzhang/zulip,dhcrzf/zulip,tommyip/zulip,brockwhittaker/zulip,brockwhittaker/zulip,rishig/zulip,showell/zulip,mahim97/zulip,Galexrt/zulip,dhcrzf/zulip,amanharitsh123/zulip,dhcrzf/zulip,brainwane/zulip,Galexrt/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,verma-varsha/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,jackrzhang/zulip,zulip/zulip,hackerkid/zulip,brainwane/zulip,eeshangarg/zulip,timabbott/zulip,mahim97/zulip,verma-varsha/zulip,amanharitsh123/zulip,brainwane/zulip,jackrzhang/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,andersk/zulip,brockwhittaker/zulip,timabbott/zulip,Galexrt/zulip,kou/zulip,tommyip/zulip,showell/zulip,brockwhittaker/zulip,showell/zulip,timabbott/zulip,Galexrt/zulip,showell/zulip,kou/zulip,tommyip/zulip,punchagan/zulip,eeshangarg/zulip,brockwhittaker/zulip,punchagan/zulip,amanharitsh123/zulip,brockwhittaker/zulip,hackerkid/zulip,Galexrt/zulip,punchagan/zulip,synicalsyntax/zulip,rishig/zulip,shubhamdhama/zulip,hackerkid/zulip,Galexrt/zulip,rishig/zulip,rishig/zulip,Galexrt/zulip,hackerkid/zulip,punchagan/zulip,mahim97/zulip,rishig/zulip,verma-varsha/zulip,eeshangarg/zulip,synicalsyntax/zulip,andersk/zulip,punchagan/zulip,rht/zulip,rht/zulip,zulip/zulip,brainwane/zulip,shubhamdhama/zulip,zulip/zulip,dhcrzf/zulip,dhcrzf/zulip,timabbott/zulip,synicalsyntax/zulip,tommyip/zulip,dhcrzf/zulip,andersk/zulip,synicalsyntax/zulip,synicalsyntax/zulip,kou/zulip,shubhamdhama/zulip,tommyip/zulip,rht/zulip,timabbott/zulip,verma-varsha/zulip,showell/zulip,jackrzhang/zulip,rht/zulip,andersk/zulip,timabbott/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,amanharitsh123/zulip,eeshangarg/zulip,tommyip/zulip,verma-varsha/zulip,synicalsyntax/zulip,amanharitsh123/zulip,kou/zulip,synicalsyntax/zulip,rht/zulip,jackrzhang/zulip,verma-varsha/zulip,mahim97/zulip,shubhamdhama/zulip,timabbott/zulip,andersk/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,mahim97/zulip,rishig/zulip,showell/zulip,dhcrzf/zulip,mahim97/zulip,jackrzhang/zulip,amanharitsh123/zulip,eeshangarg/zulip,brainwane/zulip,andersk/zulip