[tools] Add helper for updating namespace buffers

[schallert]

What this PR does / why we need it:

Fixes #

Special notes for your reviewer:

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

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

[codecov[bot]]

Codecov Report

Merging #3513 (6a409ad) into master (4477597) will decrease coverage by 0.3%. Report is 503 commits behind head on master. The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #3513     +/-   ##
========================================
- Coverage    56.1%   55.9%   -0.3%     
========================================
  Files         548     548             
  Lines       61372   61372             
========================================
- Hits        34483   34334    -149     
- Misses      23802   23932    +130     
- Partials     3087    3106     +19     

Flag	Coverage Δ
aggregator	57.3% <ø> (-0.1%)	:arrow_down:
cluster	∅ <ø> (∅)
collector	54.3% <ø> (ø)
dbnode	60.3% <ø> (-0.4%)	:arrow_down:
m3em	46.4% <ø> (ø)
metrics	19.8% <ø> (ø)
msg	74.5% <ø> (-0.2%)	:arrow_down:

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