Add integration tests about SSL on azure-security-keyvault-jca

[yiliuTo]

This IT should include:

• a server side app which has a self-signed certificate stored in Azure Key Vault
• use a restclient to visit the app and check if succeed.

[chenrujun]

Closing this issue because we already have https://github.com/Azure/azure-sdk-for-java/blob/azure-security-keyvault-jca_1.0.0-beta.7/sdk/keyvault/azure-security-test-keyvault-jca/src/test/java/com/azure/security/keyvault/jca/ServerSocketTest.java