Remove PKCS12 Deprecation Warning in KeyStoreUtils

KeyStoreUtils.getTrustStore() logs a warning message indicating the PKCS12 trust stores are deprecated in favor of JKS.  JEP 229 changed the default key store type to PKCS12 starting with Java 9. The Site to Site Client, GetHTTP, and PostHTTP Processors use the KeyStoreUtils.getTrustStore() method. The method itself checks the trust store type, logs the warning for PKCS12 and delegates to KeyStoreUtils.getKeyStore().

References to KeyStoreUtils.getTrustStore() should be replaced with KeyStoreUtils.getKeyStore() and the getTrustStore() method should be removed to avoid confusing log warnings in deployments where PKCS12 trust stores are used.