fix: decrease default host MTU for Azure Stack

[jadarsie]

Reason for Change:
Decrease default MTU on the host when deploying to Azure Stack

Issue Fixed:
Related to #1330

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

[honcao]

/approve

[acs-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[honcao]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #1346 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1346   +/-   ##
=======================================
  Coverage   75.45%   75.45%           
=======================================
  Files         128      128           
  Lines       18124    18124           
=======================================
  Hits        13675    13675           
  Misses       3651     3651           
  Partials      798      798

[CecileRobertMichon]

/lgtm