[LIBCLOUD-952] Use disk size and storage tier also when creating node from template

[mlackman]

Add disk size and storage tier

Description

Added missing storage_tier and disk size to the request body for creating node. Storage_tier has meaningful default value when not provided.

Status

• done, ready for review

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[codecov-io]

Codecov Report

Merging #1124 into trunk will increase coverage by <.01%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           trunk   #1124      +/-   ##
========================================
+ Coverage   85.4%   85.4%   +<.01%     
========================================
  Files        346     346              
  Lines      66200   66218      +18     
  Branches    5892    5892              
========================================
+ Hits       56535   56553      +18     
  Misses      7267    7267              
  Partials    2398    2398

Impacted Files	Coverage Δ
libcloud/test/compute/test_upcloud.py	92.19% <ø> (ø)	⬆️
libcloud/common/upcloud.py	91.01% <100%> (+0.53%)	⬆️
libcloud/test/common/test_upcloud.py	100% <100%> (ø)	⬆️

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[pquentin]

Thank you! Merged in trunk. Please close LIBCLOUD-952. Thanks.