zerver: Require permissions be acceptable to do_change_is_admin.
zerver: Require permissions be acceptable to do_change_is_admin.

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