Enable Checkstyle fail on error / violation for Key Vault (#2969)
Enable Checkstyle fail on error / violation for Key Vault (#2969)

* Now that KeyVault data-plane has no more checkstyle errors or violations, we are now enforcing build failure for this project and all child modules.

* Install build tools locally so that checkstyle can run.

* Fix whitespace

* It is not necessary to run checkstyle:check as the build will fail satisfactorily under the analyze job.

Azure/azure-sdk-for-java,selvasingh/azure-sdk-for-java,selvasingh/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,selvasingh/azure-sdk-for-java,navalev/azure-sdk-for-java