Add polling to App.get_generation in tests

[filariow]

Changes

Make tests more robust adding a polling on App.get_generation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• All acceptance test scenarios included in the PR which verifies a bugfix or a requested feature reported by a non-member are tagged with @external-feedback tag.
• Follows the commit message standard

[sadlerap]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sadlerap

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[filariow]

/retest

[codecov]

Codecov Report

Merging #1466 (f391fdf) into master (ecde2a4) will not change coverage.
Report is 3 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1466   +/-   ##
=======================================
  Coverage   58.16%   58.16%           
=======================================
  Files          35       35           
  Lines        3014     3014           
=======================================
  Hits         1753     1753           
  Misses       1093     1093           
  Partials      168      168           

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