Allow creating intstances with ST1 or SC1 EBS volume types

[kapilchouhan99]

Description

• Users can create a VM with the Throughput Optimized HDD (st1) or Cold HDD (sc1) volume type.
• Changed ebs_no_delete_on_term option as a ebs_delete_on_term boolean option and its default value is true, because earlier if we created any VM with st1 or sc1 volume type, then there is no option to delete this volume on instance termination.
• Added test cases
• Ensured cook-style on the code changes made

Related Issue

Fixes: #651

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commits have been signed-off for the Developer Certificate of Origin.