switch from Vault to local cached creds

[asmorodskyi]

No description provided.

[codecov]

Codecov Report

Merging #147 (e9cc980) into master (c90a1e1) will decrease coverage by 3.42%.
The diff coverage is 77.10%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   84.35%   80.93%   -3.43%     
==========================================
  Files          28       26       -2     
  Lines        2391     1962     -429     
==========================================
- Hits         2017     1588     -429     
  Misses        374      374              

Impacted Files	Coverage Δ
ocw/lib/EC2.py	77.11% <0.00%> (+2.01%)	⬆️
ocw/lib/db.py	38.12% <0.00%> (ø)
ocw/lib/gce.py	60.71% <0.00%> (+0.48%)	⬆️
tests/conftest.py	100.00% <ø> (ø)
ocw/lib/azure.py	79.31% <33.33%> (-2.29%)	⬇️
ocw/lib/provider.py	89.02% <50.00%> (-9.47%)	⬇️
tests/test_azure.py	95.53% <100.00%> (-0.55%)	⬇️
tests/test_ec2.py	98.17% <100.00%> (+<0.01%)	⬆️
tests/test_gce.py	97.95% <100.00%> (+0.08%)	⬆️
tests/test_provider.py	100.00% <100.00%> (ø)
... and 1 more

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