Add config options for extra security groups and iam policies for hea…

[cartalla]

…d and compute nodes

Add the following config options:

• slurm/ParallelClusterConfig/ClusterConfig
• slurm/SlurmCtl/AdditionalSecurityGroups
• slurm/SlurmCtl/AdditionalIamPolicies
• slurm/SlurmCtl/Imds/Secured
• slurm/InstanceConfig/AdditionalSecurityGroups
• slurm/InstanceConfig/AdditionalIamPolicies

Added documentation for all config parameters.

Changed the StackName default from slurm-top to slurm-config.

Fix the slurm/ParallelClusterConfig/Dcv/Enabled option. Change the option name from Enable to Enabled to match ParallelCluster.

Fix the setting of ParallelCluster HeadNode/Dcv/AllowedIps config Was setting from non-existent slurm/ParallelClusterConfig/AllowedIps instead of slurm/ParallelClusterConfig/HeadNode/Dcv/AllowedIps.

Delete the following config option because it uses legacy cluster.

• slurm/EdfaSlurmClusterStackName

Resolves #225

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