Fix disk expand for EL7 race conditions.

[zmarano]

Proposed fix for disk expansion race condition.

[codecov]

Codecov Report

Merging #888 into development will increase coverage by 1.29%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #888      +/-   ##
===============================================
+ Coverage        96.07%   97.37%   +1.29%     
===============================================
  Files               57       58       +1     
  Lines             4769     4801      +32     
  Branches           244      246       +2     
===============================================
+ Hits              4582     4675      +93     
+ Misses             162      108      -54     
+ Partials            25       18       -7     

Impacted Files	Coverage Δ
...-engine/google_compute_engine/boto/compute_auth.py	100.00% <0.00%> (ø)
...le_compute_engine/instance_setup/instance_setup.py	94.77% <0.00%> (+0.65%)	⬆️
...compute_engine/metadata_scripts/script_executor.py	96.87% <0.00%> (+3.12%)	⬆️
...gle-compute-engine/google_compute_engine/compat.py	75.36% <0.00%> (+15.94%)	⬆️
...ompute-engine/google_compute_engine/test_compat.py	88.88% <0.00%> (+22.22%)	⬆️
...gle_compute_engine/boto/tests/compute_auth_test.py	100.00% <0.00%> (+77.19%)	⬆️

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[hopkiw]

/lgtm

[hopkiw]

did it not work without this?? initrd should have its own systemctl, i'm unsure what the behavior is if we import the system systemctl binary

[zmarano]

I didn't try... this is technically what you should do for any of these things (its like declaring your package dependencies). In any case, it would not hurt as it would just re-copy the same thing if its done elsewhere.

[zmarano]

It appears from other modules that use it- that this is not required... I'll remove it.