* Address `boto` deprecation warnings
This commit eliminates the following warning:
../boto/ec2/connection.py:582:
PendingDeprecationWarning: The current get_all_instances implementation will be replaced with get_all_reservations.
`boto` isn't likely to ever make good on this warning, but doing the replacement will
declutter the `moto` test output.
* Remove `invoke_lambda` tracebacks from unit test logging
If an exception is encountered, the details are returned in the response payload.
Printing the traceback was just adding noise to the pytest output.
* Use known AMIs in unit tests
This commit eliminates the following warning in the pytest output:
`PendingDeprecationWarning: Could not find AMI with image-id:ami-123456, in the near future this will cause an error.`
Known, pre-loaded AMI image ids are used instead of random ids that don't actually
exist in the moto backend. The integrity of the tests is unaffected by this change.
A test has been added to provide explicit coverage of the PendingDeprecationWarning
raised when an invalid AMI image id is passed to moto.
