generate-fixtures: Extract zulip_test_template creation as a function.
generate-fixtures: Extract zulip_test_template creation as a function.

This will be helpful in the upcoming changes which will make use
of this extracted function to re-create zulip_test_template after
migrating zulip_test db so that we have latest schema in tests.

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