tools: use CommandContext to cancel conduit process.

[winder]

Summary

I was noticing that the conduit process was not always being terminated. This makes the termination more reliable by:

1. Using a CommandContext to do the heavy lifting.
2. Setting a WaitDelay which should cause wait to timeout and trigger a Kill if a graceful shutdown takes too long.

Also added a couple more lifecycle log messages.

[codecov]

Codecov Report

Merging #5636 (dde3649) into master (8b19c62) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5636   +/-   ##
=======================================
  Coverage   54.95%   54.95%           
=======================================
  Files         463      463           
  Lines       64476    64476           
=======================================
+ Hits        35432    35434    +2     
  Misses      26661    26661           
+ Partials     2383     2381    -2     

see 6 files with indirect coverage changes

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