* Use Boto3 for ec2_group
Currently boto doesn't support ipv6. To support ipv6 in ec2_group, we need boto3.
boto3 has significant API changes, which caused more re-factoring for ec2_group module.
Added additional integration test to test_ec2_group role.
* Follow the standard for boto3 ansible
Fixed imports. Use boto3 ansible exception with camel_dict_to_snake_dict.
Refactored the call to authorize/revoke ingress and egress.
* Removed dependancy with module ipaddress
Added new parameter called cidr_ipv6 for specifying
ipv6 addresses inline with how boto3 handles ipv6 addresses.
* Updated integration test
* Added ipv6 integration test for ec2_group
* Set purge_rules to false for integration test
* Fixed import statements
Added example for ipv6.
Removed defining HAS_BOTO3 variable and import HAS_BOTO3 from ec2.
Cleaned up import statements.
* Fixed exception handling
* Add IAM permissions for ec2_group tests
Missing AuthorizeSecurityGroupEgress necessary for latest tests
* Wrapped botocore import in try/except block
Import just botocore to be more similar to other modules
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