GCP CE/CloudSQL can't run with multiple threads

[Aboisier]

In computeengine.py and cloudsql.py (will soon be merged with PR #164 ) need to hardcode the thread config to 1, otherwise, we get SSL errors.

Repro steps:

• Have more than one resource (eg. 2 vms, or 2 cloud SQL instances)
• Start a scan
• You should see errors in the console, or sometimes it hangs indefinitely

Here's different errors I got:

• [SSL: BLOCK_CIPHER_PAD_IS_WRONG] block cipher pad is wrong (_ssl.c:2217)Failed to fetch backups for SQL instance xxxxxxxx: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:2217)
• python SSL: WRONG_VERSION_NUMBER

[x4v13r64]

Yep, this is an odd one. Will either require diving into the API's implementation or maybe wait until Google does a decent job with their own libraries...

[x4v13r64]

This seems to be the explanation: https://stackoverflow.com/a/37236585

Looking at the following it isn't clear if CE/CloudSQL should now be thread safe:
googleapis/google-cloud-python#1214
googleapis/google-cloud-python#3674

[Remi05]

This is fixed in dev since the refactoring was merged!