admin: Use client-side data to populate list of streams.
admin: Use client-side data to populate list of streams.

Fixes #3786

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