Fixes security group handling for spot requests launching into a VPC on AWS
[AWS | AutoScaling] Do not send Instances for update_auto_scaling_group
(Avoids 413 Request Entity Too Large for ASGs with lots of instances)
[AWS | Autoscaling] whitelist the options for update_auto_scaling_group
[AWS | Autoscaling] whitelist the options for create_auto_scaling_group
[AWS | Autoscaling] dry up expected options
[AWS | Autoscaling] correct whitelist for create_auto_scaling_group
[AWS | Autoscaling] ensure tests work in 1.8.7
Swapped to SecurityGroupId
[core] Removes unused getting of Constant
Merge pull request #1885 from fog/cleanup_cc69d10c

[core] Removes unused getting of Constant
Merge pull request #1874 from mikehale/asg-exclude-instances

[AWS | AutoScaling] Do not send Instances for update_auto_scaling_group
Merge pull request #1831 from contentfree/master

Fixes security group handling for spot instances launched into an EC2 VPC
fix create_tenant Mock response description and name

The attributes hash keys are all symbols. Please reference:
https://github.com/fog/fog/blob/master/lib/fog/core/attributes.rb#L20
Merge pull request #1889 from dmcinnes/patch-1

fix create_tenant Mock response description and name
[vcloud|compute] better defaults for configuring vm content-type

closes #1879