[LIBCLOUD-882] - Adding m4 instances to us-gov and brazil, m4.16xlarge to all regions #964
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Changes Title (replace this with a logical title for your changes)
Description
As of the 27th of September m4 instances have become available in Brazil and Gov-Cloud:
https://aws.amazon.com/blogs/aws/expanding-the-m4-instance-type-new-m4-16xlarge/
This is a simple change to add the new m4.16xlarge instance along with references to the new m4 types in Brazil and Gov Cloud in the REGION_DETAILS json object.
I've also updated the tests with the correct new counts for sizes for each region and added a size check for region ap-south-1.
I've limited the scope of this change to just m4 instances for simplicities sake.
Status
Checklist (tick everything that applies)