[coordinator] Fix annotation bytes not being passed to write request

[vpranckaitis]

What this PR does / why we need it:

Fixes coordinator not passing annotation bytes to write request

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:

NONE

Does this PR require updating code package or user-facing documentation?:

NONE

[codecov]

Codecov Report

Merging #3537 (5f61918) into master (5f61918) will not change coverage.
The diff coverage is n/a.

❗ Current head 5f61918 differs from pull request most recent head 64df41e. Consider uploading reports for the commit 64df41e to get more accurate results

@@          Coverage Diff           @@
##           master   #3537   +/-   ##
======================================
  Coverage    55.8%   55.8%           
======================================
  Files         549     549           
  Lines       61437   61437           
======================================
  Hits        34341   34341           
  Misses      23990   23990           
  Partials     3106    3106           

Flag	Coverage Δ
aggregator	57.1% <0.0%> (ø)
cluster	∅ <0.0%> (∅)
collector	54.3% <0.0%> (ø)
dbnode	60.3% <0.0%> (ø)
m3em	46.4% <0.0%> (ø)
metrics	19.8% <0.0%> (ø)
msg	74.4% <0.0%> (ø)

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