Reset dhcp config to send host information on SUSE distros

[rjschwei]

• Reset the dhcp configuration to send the host information when an instance
  is being deprovisioned. This ensures that instances from a managed VM
  created from a running instance send the proper information to the DHCP
  server. Thanks Joao Silva.

Description

Issue #

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PR information

• The title of the PR is clear and informative.
• 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

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[codecov]

Codecov Report

Merging #2583 (f053212) into develop (1d434f9) will decrease coverage by 0.01%.
The diff coverage is 45.45%.

@@             Coverage Diff             @@
##           develop    #2583      +/-   ##
===========================================
- Coverage    71.89%   71.87%   -0.02%     
===========================================
  Files          103      104       +1     
  Lines        15515    15526      +11     
  Branches      2467     2469       +2     
===========================================
+ Hits         11155    11160       +5     
- Misses        3860     3865       +5     
- Partials       500      501       +1     

Impacted Files	Coverage Δ
azurelinuxagent/pa/deprovision/factory.py	54.54% <33.33%> (-3.35%)	⬇️
azurelinuxagent/pa/deprovision/suse.py	50.00% <50.00%> (ø)

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[narrieta]

@anhvoms could you take a look?