instances.create: expose retry settings, add exponential backoff

[shamrin]

No description provided.

[shamrin]

* is a keyword-only argument marker, probably a good idea to do it for all new arguments.

https://docs.python.org/3/glossary.html#term-parameter

[bemyak]

It's not a big change, but it creates less variables and I guess it's a bit easier to read:

        import itertools # ← at the top
        # Wait for instance to enter provisioning state with timeout
        start_time = time.monotonic()
        for i in itertools.count():
            instance = self.get_by_id(id)
            if instance.status != InstanceStatus.ORDERED:
                return instance

            time_left = max_wait_time - (time.monotonic() - start_time)
            if time_left < 0:
                raise TimeoutError(
                    f"Instance {id} did not enter provisioning state within {max_wait_time:.1f} seconds")

            interval = initial_interval * backoff_coefficient ** i
            time.sleep(min(interval, max_interval, time_left))

[shamrin]

Thanks! I've used some ideas from your version.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.36%. Comparing base (657b3b1) to head (68ef37a).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
datacrunch/instances/instances.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   87.98%   87.36%   -0.62%     
==========================================
  Files          21       21              
  Lines        1124     1148      +24     
==========================================
+ Hits          989     1003      +14     
- Misses        135      145      +10     

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