Calling HostsPerLine() before Add() results in a panic with plain vanilla macOS hosts file

[rfay]

If you call HostsPerLine() before Add(), (with a plain-vanilla macOS starter hosts file) you get a panic, like this:

panic: runtime error: index out of range [6] with length 4

goroutine 1 [running]:
github.com/goodhosts/hostsfile.(*Hosts).Add(0x140003264d0, {0x16eff7b14, 0x9}, {0x14000460fe0?, 0x1, 0x1})
	/Users/rfay/workspace/ddev/vendor/github.com/goodhosts/hostsfile/hosts.go:167 +0x3ec
github.com/ddev/ddev/pkg/ddevapp.AddHostEntry({0x16eff7b06, 0xd}, {0x16eff7b14, 0x9})
	/Users/rfay/workspace/ddev/pkg/ddevapp/hostname_mgt.go:140 +0xd4
github.com/ddev/ddev/cmd/ddev/cmd.glob..func30(0x1019e66c0?, {0x14000066600?, 0x2, 0x2})
	/Users/rfay/workspace/ddev/cmd/ddev/cmd/hostname.go:74 +0x20c
github.com/spf13/cobra.(*Command).execute(0x1019e66c0, {0x140000665a0, 0x2, 0x2})
	/Users/rfay/workspace/ddev/vendor/github.com/spf13/cobra/command.go:860 +0x4ac
github.com/spf13/cobra.(*Command).ExecuteC(0x1019e98c0)
	/Users/rfay/workspace/ddev/vendor/github.com/spf13/cobra/command.go:974 +0x354
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/rfay/workspace/ddev/vendor/github.com/spf13/cobra/command.go:902
github.com/ddev/ddev/cmd/ddev/cmd.Execute()
	/Users/rfay/workspace/ddev/cmd/ddev/cmd/root.go:143 +0x40
main.main()
	/Users/rfay/workspace/ddev/cmd/ddev/main.go:20 +0xac

This is demonstrated in a test repo: https://github.com/rfay/goodhostsbug/tree/broken

It's fixed by changing HostsPerLine() to later, see https://github.com/rfay/goodhostsbug