[GCP IMDS] Use fully qualified name

[Arkelenia]

Use the fully-qualified name for the GCP IMDS endpoint

Description

This PR replaces the current IMDS endpoint http://metadata/computeMetadata/v1/... with the fully-qualified name version http://metadata.google.internal/computeMetadata/v1/....

The current state assumes the presence of google.internal as a search domain to work properly which may not be the case when the endpoint is resolved from a container or a Kubernetes pod running on a GCP node.

Status

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)

[micafer]

LGTM

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.35%. Comparing base (6a7f04a) to head (b6f6772).

Files with missing lines	Patch %	Lines
libcloud/common/google.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2060   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files         353      353           
  Lines       81848    81848           
  Branches     8998     8998           
=======================================
  Hits        68224    68224           
  Misses      10797    10797           
  Partials     2827     2827           

Files with missing lines	Coverage Δ
libcloud/common/google.py	71.35% <0.00%> (ø)

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