sensorlog: gosh: address TODOs

More specifically:
- Eliminates Shell.Main, since it's easy enough to use
Shell.Fn and set the returned Cmd's Args
- Renames Shell.Fn to Shell.FuncCmd
- Extends Shell.{Cmd,FuncCmd} comments to explain what's
done with the given arguments
- Makes it so NewShell takes a snapshot of os.Environ() and
uses that henceforth
- Makes it so NewShell filters out any gosh env vars coming
from outside
- Renames registry.go's Fn to Func, Register to
RegisterFunc, and Call to CallFunc
- Adjusts the behavior of RegisterFunc so that names are
augmented to produce collision-resistant handles of the
form "file:line:name"
- Makes callFunc and Func.call private for now, until
there's a clear need for them to be exported
- Eliminates gosh.Run
- Renames Cmd.Shutdown (which we decided to keep) to
Cmd.Terminate
- Changes Cmd.Signal and Cmd.Terminate to fail if Wait
has been called
- Drops Cmd.Kill; if it proves necessary, we'll add a
gosh.Kill implementation of os.Signal that tells
Cmd.Signal and Cmd.Terminate to issue Process.Kill

Also, updates v23test:
- Same changes as in gosh (Fn->FuncCmd, no more Main)
- Replaces v23test.Run with TestMain (simple case) and
InitTestMain (advanced case)
- Eliminates the hack with credentials env vars

MultiPart: 8/8

Change-Id: Icf571916d4b6f7ad0e79e52e0c42f0639ee8fec9
3 files changed
tree: 0e944a1e5554b261e8254ca4f39ff9f64bd88e41
  1. go/
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  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
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