fix(grpc): grpc plugin fails to handle requests after reset

[rustatian]

Reason for This PR

closes: #69

Description of Changes

• Update pool pointer after reset.
• Respect user Requeue option (plugin: jobs).

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #70 (332bb2c) into master (7e65ed5) will decrease coverage by 0.11%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   68.53%   68.41%   -0.12%     
==========================================
  Files         112      112              
  Lines        9314     9327      +13     
==========================================
- Hits         6383     6381       -2     
- Misses       2302     2318      +16     
+ Partials      629      628       -1     

Impacted Files	Coverage Δ
jobs/protocol.go	48.83% <37.50%> (-3.80%)	:arrow_down:
grpc/plugin.go	62.01% <100.00%> (+15.61%)	:arrow_up:
grpc/proxy/proxy.go	62.67% <100.00%> (+0.53%)	:arrow_up:
grpc/server.go	65.76% <100.00%> (+0.31%)	:arrow_up:
jobs/metrics.go	95.91% <100.00%> (-4.09%)	:arrow_down:
jobs/listener.go	38.59% <0.00%> (-14.04%)	:arrow_down:
sqs/item.go	64.78% <0.00%> (-6.34%)	:arrow_down:
jobs/plugin.go	63.27% <0.00%> (-0.50%)	:arrow_down:

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