Revert "Disable overcommit accounting on E2 VMs (#865)"

[zmarano]

This reverts commit 880daf9.

[codecov]

Codecov Report

Merging #871 into development will increase coverage by 0.04%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development     #871      +/-   ##
===============================================
+ Coverage        97.32%   97.36%   +0.04%     
===============================================
  Files               58       58              
  Lines             4784     4782       -2     
  Branches           245      244       -1     
===============================================
  Hits              4656     4656              
+ Misses             109      108       -1     
+ Partials            19       18       -1

Impacted Files	Coverage Δ
...engine/instance_setup/tests/instance_setup_test.py	100% <100%> (ø)	⬆️
...le_compute_engine/instance_setup/instance_setup.py	94.55% <100%> (+1.26%)	⬆️

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[wrigri]

/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adjackura, wrigri, zmarano
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