Add negative tests for versionless feature support

[cherylking]

Found a way to check the build.log for error messages via the postBuildHookScript.

[cherylking]

This is what the output looks like in one of the failing test build.log files:

[ERROR] Failed to execute goal io.openliberty.tools:liberty-maven-plugin:3.10.4-SNAPSHOT:install-feature (install-feature) on project kernel-install-versionless-feature-fail-bad-platform-it: Error installing features for server test: CWWKF1515E: The badname platform could not be found.
[ERROR] CWWKF1516E: The platform could not be determined. The following versionless features cannot be installed: [jaxws].
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Running post-build script: /Users/cherylking/gitForks/ci.maven/liberty-maven-plugin/target/it/kernel-install-versionless-feature-fail-bad-platform-it/cleanTest.bsh
Running post-build script: /Users/cherylking/gitForks/ci.maven/liberty-maven-plugin/target/it/kernel-install-versionless-feature-fail-bad-platform-it/checkErrorVersionlessFeature.bsh
Correct error message found for test kernel-install-versionless-feature-fail-bad-platform-it
Cleaned target dir(s) for /Users/cherylking/gitForks/ci.maven/liberty-maven-plugin/target/it/kernel-install-versionless-feature-fail-bad-platform-it
Finished post-build script: /Users/cherylking/gitForks/ci.maven/liberty-maven-plugin/target/it/kernel-install-versionless-feature-fail-bad-platform-it/cleanTest.bsh