Tweak shutdown sequence

[pkedy]

Description

Continuation of #3088. This PR changes the shutdown sequence to:

• stop actor
• delay
• close components
• exit

Issue reference

Resolves #dapr/components-contrib#779

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Unit tests passing
• End-to-end tests passing
• Extended the documentation / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]
• Specification has been updated / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]
• Provided sample for the feature / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]

[codecov]

Codecov Report

Merging #3094 (bb7da38) into master (4efc428) will decrease coverage by 0.01%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #3094      +/-   ##
==========================================
- Coverage   58.99%   58.97%   -0.02%     
==========================================
  Files          84       84              
  Lines        7694     7696       +2     
==========================================
  Hits         4539     4539              
- Misses       2842     2844       +2     
  Partials      313      313              

Impacted Files	Coverage Δ
pkg/runtime/runtime.go	51.67% <20.00%> (-0.11%)	⬇️

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[pkedy]

/cc @artursouza @mukundansundar @yaron2

The covecov errors are because I changed the body of ShutdownWithWait and it is not covered by a test (it calls os.Exit).