Revert "Examples: Add a JWT authentication example (#5154)"

This reverts commit ac52e27.

See #5665. Right now it is not any more informative than the header
example, and it encourages some practices I'd rather avoid. It will get
re-added later with improvements.

examples/BUILD.bazel

@@ -98,24 +98,6 @@ java_binary(
     ],
 )
 
-java_binary(
-    name = "auth-client",
-    testonly = 1,
-    main_class = "io.grpc.examples.authentication.AuthClient",
-    runtime_deps = [
-        ":examples",
-    ],
-)
-
-java_binary(
-    name = "auth-server",
-    testonly = 1,
-    main_class = "io.grpc.examples.authentication.AuthServer",
-    runtime_deps = [
-        ":examples",
-    ],
-)
-
 java_binary(
     name = "route-guide-client",
     testonly = 1,

examples/README.md

@@ -25,8 +25,6 @@ before trying out the examples.
 
 - [Json serialization](src/main/java/io/grpc/examples/advanced)
 
-- [Authentication](AUTHENTICATION_EXAMPLE.md)
-
 - [Google Authentication](example-gauth/GOOGLE_AUTH_EXAMPLE.md)
 
 ### To build the examples

examples/build.gradle

@@ -90,20 +90,6 @@ task helloWorldClient(type: CreateStartScripts) {
     classpath = startScripts.classpath
 }
 
-task authServer(type: CreateStartScripts) {
-    mainClassName = 'io.grpc.examples.authentication.AuthServer'
-    applicationName = 'auth-server'
-    outputDir = new File(project.buildDir, 'tmp')
-    classpath = startScripts.classpath
-}
-
-task authClient(type: CreateStartScripts) {
-    mainClassName = 'io.grpc.examples.authentication.AuthClient'
-    applicationName = 'auth-client'
-    outputDir = new File(project.buildDir, 'tmp')
-    classpath = startScripts.classpath
-}
-
 task compressingHelloWorldClient(type: CreateStartScripts) {
     mainClassName = 'io.grpc.examples.experimental.CompressingHelloWorldClient'
     applicationName = 'compressing-hello-world-client'
@@ -116,8 +102,6 @@ applicationDistribution.into('bin') {
     from(routeGuideClient)
     from(helloWorldServer)
     from(helloWorldClient)
-    from(authServer)
-    from(authClient)
     from(compressingHelloWorldClient)
     fileMode = 0755
 }