auth library is required build

Author: chingor13

.kokoro/common.sh

@@ -419,6 +419,10 @@ function install_modules() {
     printf "Installing submodules:\n%s\n" "$all_submodules"
 
     always_install_deps_list=(
+      'google-auth-library-java/appengine'
+      'google-auth-library-java/bom'
+      'google-auth-library-java/credentials'
+      'google-auth-library-java/oauth2_http'
       'sdk-platform-java/java-shared-dependencies'
       'sdk-platform-java/java-shared-dependencies/first-party-dependencies'
       'sdk-platform-java/java-shared-dependencies/third-party-dependencies'