bulk_create: Remove some long-dead code.
bulk_create: Remove some long-dead code.

We used to use these in populate_db, but haven't done so in a long
time, and it doesn't seem likely that will change anytime in the
future.

kou/zulip,dhcrzf/zulip,andersk/zulip,tommyip/zulip,brainwane/zulip,jackrzhang/zulip,eeshangarg/zulip,brainwane/zulip,shubhamdhama/zulip,synicalsyntax/zulip,dhcrzf/zulip,dhcrzf/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,shubhamdhama/zulip,andersk/zulip,synicalsyntax/zulip,rht/zulip,showell/zulip,punchagan/zulip,punchagan/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,hackerkid/zulip,punchagan/zulip,synicalsyntax/zulip,jackrzhang/zulip,timabbott/zulip,andersk/zulip,shubhamdhama/zulip,rishig/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,showell/zulip,dhcrzf/zulip,jackrzhang/zulip,showell/zulip,rht/zulip,synicalsyntax/zulip,showell/zulip,timabbott/zulip,timabbott/zulip,kou/zulip,brainwane/zulip,tommyip/zulip,brainwane/zulip,timabbott/zulip,jackrzhang/zulip,kou/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,shubhamdhama/zulip,punchagan/zulip,rishig/zulip,tommyip/zulip,brainwane/zulip,brainwane/zulip,timabbott/zulip,jackrzhang/zulip,shubhamdhama/zulip,shubhamdhama/zulip,eeshangarg/zulip,rht/zulip,synicalsyntax/zulip,hackerkid/zulip,zulip/zulip,jackrzhang/zulip,shubhamdhama/zulip,synicalsyntax/zulip,kou/zulip,hackerkid/zulip,tommyip/zulip,eeshangarg/zulip,rht/zulip,synicalsyntax/zulip,timabbott/zulip,dhcrzf/zulip,rishig/zulip,tommyip/zulip,hackerkid/zulip,rishig/zulip,andersk/zulip,showell/zulip,rishig/zulip,eeshangarg/zulip,punchagan/zulip,rishig/zulip,timabbott/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,rht/zulip,showell/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,jackrzhang/zulip,dhcrzf/zulip,kou/zulip,tommyip/zulip,showell/zulip,zulip/zulip,zulip/zulip,tommyip/zulip