authenticate_remote_user: Accept a realm object.
authenticate_remote_user: Accept a realm object.

This paves the path for further code cleanup migrations.

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