Minor Description
fix typo in DefaultSchemaRegistryClient, otherwise `mvn test` will fail like below
```
[INFO] -------------------------------------------------------
[INFO] T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.ranger.services.schema.registry.client.SchemaRegistryResourceMgrTest
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.584 s <<< FAILURE! - in org.apache.ranger.services.schema.registry.client.SchemaRegistryResourceMgrTest
[ERROR] org.apache.ranger.services.schema.registry.client.SchemaRegistryResourceMgrTest.getSchemaRegistryResources Time elapsed: 0.424 s <<< ERROR!
java.lang.Error:
Unresolved compilation problem:
Syntax error on token ";", delete this token
at org.apache.ranger.services.schema.registry.client.connection.DefaultSchemaRegistryClient.<init>(DefaultSchemaRegistryClient.java:36)
at org.apache.ranger.services.schema.registry.client.AutocompletionAgent.<init>(AutocompletionAgent.java:50)
at org.apache.ranger.services.schema.registry.client.util.TestAutocompletionAgent.<init>(TestAutocompletionAgent.java:28)
at org.apache.ranger.services.schema.registry.client.SchemaRegistryResourceMgrTest.getSchemaRegistryResources(SchemaRegistryResourceMgrTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
```
mvn version 3.6.3 + java 1.8
```
mvn -v
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /home/ubuntu/.sdkman/candidates/maven/current
Java version: 1.8.0_372, vendor: Tencent, runtime: /home/ubuntu/.sdkman/candidates/java/8.0.372-kona/jre
Default locale: en, platform encoding: UTF-8
OS name: "linux", version: "5.15.0-72-generic", arch: "amd64", family: "unix"
```
