[tests] Add Env and Zone while handling placements with resources.Coordinator

[fishie9]

What this PR does / why we need it:

This PR adds Zone and Env to the PlacementOpts for resources.Coordinator. We can now specify the zone and environment of the placement while initializing it.

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?:

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[codecov]

Codecov Report

Merging #3796 (0ac5b42) into master (b36cbb0) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #3796     +/-   ##
========================================
- Coverage    56.9%   56.8%   -0.1%     
========================================
  Files         552     552             
  Lines       63064   63064             
========================================
- Hits        35890   35862     -28     
- Misses      23984   24005     +21     
- Partials     3190    3197      +7     

Flag	Coverage Δ
aggregator	63.4% <ø> (+<0.1%)	⬆️
cluster	∅ <ø> (∅)
collector	58.4% <ø> (ø)
dbnode	60.4% <ø> (-0.1%)	⬇️
m3em	46.4% <ø> (ø)
metrics	19.7% <ø> (ø)
msg	74.2% <ø> (-0.2%)	⬇️

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