SUSE: Fix valid values for DHCLIENT_HOSTNAME_OPTION

[nagworld9]

Description

According to wicked's source agent should support all three types ("AUTO", 'AUTO', and AUTO). If it matches, agent shouldn't update the hostname.

This work is addressing the GitHub issue #2614

Issue #

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PR information

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• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #2643 (bde37e0) into develop (05d44c8) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           develop    #2643   +/-   ##
========================================
  Coverage    71.91%   71.91%           
========================================
  Files          103      103           
  Lines        15654    15654           
  Branches      2494     2494           
========================================
  Hits         11258    11258           
  Misses        3880     3880           
  Partials       516      516           

Impacted Files	Coverage Δ
azurelinuxagent/common/osutil/suse.py	45.65% <0.00%> (ø)

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