EMR Allocation Strategies with Instance Selector

[jagpk]

Issue #, if available:

Description of changes:

1. Added Cloud9 IDE to install and run amazon-ec2-instance-selector CLI.
2. Added EMR allocation strategies, Capacity Optimized for Spot and Lowest Price for OD.
3. Updated Selecting instance types use AWS Instance Selector CLI.
4. Updated instance sizes for tasks fleet between xl to 4xl and task fleet instance diversification to 15 instances.
5. Change Tasks fleet - Spot units to 32 from 40, to make it a multiple for 16 vcores (supports 4xl).
6. Updated Screenshots for Master (c4, c5 are not available in all AZs), and example tasks fleets with the 12 instance types.
7. Updated 'fleet config' page and 'examine cluster' page to show examples with 32 task nodes.
8. Updated Savings Summary to reflect latest console UI changes.
9. Updated cliexport image to reflect the changes related to EMR cluster with allocation strategies.
10. Updated cleanup steps to delete cloud9

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