Check that function calls look like ^function foo {$ in bash8, and fix all existing failures of that check. Add a note to HACKING.rst Change-Id: Ic19eecb39e0b20273d1bcd551a42fe400d54e938
Note: Nova and Horizon are not updated until those projects have migrated. Change-Id: I256ef20e7caadd9c96e6dd908c5d8b69ca5c4aeb