openapi: Rename variable function to function_name in validation test.
openapi: Rename variable function to function_name in validation test.

This is a prep commit for adding validation of the request variable
types since then we would need to actually analyze the code of the
actual function itself and we would need a variable storing the
function itself.

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