Correct disk_size parameter support for create_node

[yukw777]

Correct disk_size parameter support for create_node

Description

I realized my previous PR (#1386) wasn't quite correct as I wasn't passing in the parameter to the correct place. This fixes it.

Status

done, ready for review

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA not a big change.

[codecov-io]

Codecov Report

Merging #1388 into trunk will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            trunk    #1388      +/-   ##
==========================================
+ Coverage   86.27%   86.27%   +<.01%     
==========================================
  Files         372      372              
  Lines       76539    76541       +2     
  Branches     7003     7003              
==========================================
+ Hits        66035    66037       +2     
  Misses       7700     7700              
  Partials     2804     2804

Impacted Files	Coverage Δ
libcloud/compute/drivers/gce.py	76.81% <ø> (ø)	⬆️
libcloud/test/compute/test_gce.py	97.8% <100%> (ø)	⬆️

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[Kami]

Merged, thanks.

And yes, using keyword args is definitely preferred and much more robust and less error prone.

On a related note - can you please work on submitting an ICLA?

[yukw777]

@Kami i'll work on my ICLA now.