cmd/go: fix errors for commands run outside of modules
Since CL 148517, several commands (including list and get) work when
GO111MODULE=on even when no go.mod file is present. This broke an
assumption made by "fix" and "generate" which caused panics when run
with a list of .go files (whether or not the command was run inside a
module).
This change fixes those assumptions and adds test cases for other
commands run outside modules.
Fixes #29097
Change-Id: I7927559769c5d4617d73eb63f3b17e2f26d8c219
Reviewed-on: https://go-review.googlesource.com/c/153158 Reviewed-by: Bryan C. Mills <bcmills@google.com>