Add hypervisor_hostname attribute to OpenStack node

[micafer]

Add hypervisor_hostname attribute to OpenStack node

Description

Add hypervisor_hostname (OS-EXT-SRV-ATTR:hypervisor_hostname) attribute to OpenStack node.

Status

• done, ready for review

Checklist (tick everything that applies)

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

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 83.39%. Comparing base (c899034) to head (a891269).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2063   +/-   ##
=======================================
  Coverage   83.39%   83.39%           
=======================================
  Files         353      353           
  Lines       81696    81696           
  Branches     8634     8634           
=======================================
  Hits        68123    68123           
  Misses      10750    10750           
  Partials     2823     2823           

Files with missing lines	Coverage Δ
libcloud/compute/drivers/openstack.py	84.34% <ø> (ø)

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