zulip_tools.py: Add `get_environment()` function.
zulip_tools.py: Add `get_environment()` function.

This function can be used to determine the environment in which a
script is being executed.

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