Gradle 7 fix for ServerFeatureUtil

[kathrynkodama]

Fixes the following error when running generateFeatures or installFeature with Gradle 7:

FAILURE: Build failed with an exception.

* What went wrong:
A problem was found with the configuration of task ':installFeature' (type 'InstallFeatureTask').
  - In plugin 'liberty' type 'io.openliberty.tools.gradle.tasks.InstallFeatureTask' property 'serverFeatureUtil' is missing an input or output annotation.
    
    Reason: A property without annotation isn't considered during up-to-date checking.
    
    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.
    
    Please refer to https://docs.gradle.org/7.3.1/userguide/validation_problems.html#missing_annotation for more details about this problem.

Signed-off-by: Kathryn Kodama [email protected]

[kathrynkodama]

Updated to include fix for #682