Default disk type to source disk type in CreateDiskCopy

[giovannt0]

• Closes #210
• Opened #220 as this feature is actually missing in AWS

Signed-off-by: Theo Giovanna gtheo@google.com

[codecov-commenter]

Codecov Report

Merging #219 into master will increase coverage by 1.23%. The diff coverage is 68.33%.

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
+ Coverage   65.39%   66.63%   +1.23%     
==========================================
  Files          14       23       +9     
  Lines         968     1864     +896     
==========================================
+ Hits          633     1242     +609     
- Misses        335      622     +287     

Flag	Coverage Δ
#nosetests	66.63% <68.33%> (+1.23%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
libcloudforensics/providers/aws/forensics.py	55.71% <45.45%> (-14.06%)	:arrow_down:
...cloudforensics/providers/azure/internal/compute.py	49.03% <49.03%> (ø)
libcloudforensics/providers/gcp/forensics.py	54.92% <51.11%> (-10.08%)	:arrow_down:
...ibcloudforensics/providers/gcp/internal/compute.py	56.56% <51.93%> (-5.80%)	:arrow_down:
...cs/providers/gcp/internal/compute_base_resource.py	37.33% <52.94%> (+0.82%)	:arrow_up:
libcloudforensics/providers/aws/internal/log.py	73.07% <55.55%> (-4.20%)	:arrow_down:
...ibcloudforensics/providers/gcp/internal/project.py	61.90% <66.66%> (-3.81%)	:arrow_down:
...ibcloudforensics/providers/aws/internal/account.py	77.87% <70.00%> (-2.73%)	:arrow_down:
...cloudforensics/providers/azure/internal/account.py	70.08% <70.08%> (ø)
...bcloudforensics/providers/azure/internal/common.py	72.05% <72.05%> (ø)
... and 23 more

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