ec2_instance fails with strange error message when subnet and security_group don't match.

[tremble]

SUMMARY

Following #22 one of the integration tests started failing with a "ParameterValidationError". It turned out this was because a subnet wasn't specified, so it was dropped into the default VPC, and when it tried to find the security group it was having problems.

ISSUE TYPE

• Bug Report

COMPONENT NAME

ec2_instance

ANSIBLE VERSION

devel

CONFIGURATION

default

OS / ENVIRONMENT

integration tests

STEPS TO REPRODUCE

Create an instance using a security group and subnet from different VPCs

EXPECTED RESULTS

Error message referencing the VPC mismatch

ACTUAL RESULTS

A failure with:

"msg": "Failed to handle existing instances i-0e005a8c34c0e9e4f: An error occurred (InvalidParameterCombination) when calling the ModifyInstanceAttribute operation: No attributes specified."

[ansibullbot]

Files identified in the description:

• plugins/modules/ec2_instance.py

If these files are inaccurate, please update the component name section of the description or use the !component bot command.

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[ansibullbot]

cc @Shaps @jillr @s-hertel @wimnat
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