minor: Change topic for imported hipchat messages.
minor: Change topic for imported hipchat messages.

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