Use a common Command() function #6833
Merged
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This moves command() from cmd/ into core.Command() and uses it from the log and main package, ensuring we have a single implementation of path.Base(os.Args[0]) instead of scattering that method around. I put it in core/util.go as similar enough functions like the BuildID and revision info already live there, though I am not entirely sure it's the right place.
This came up in @aarongable's review of #6750, where he pointed out I was manually hardcoding commands instead of using command() or similar.