Remove duplicate SpotBugs defaults (#628)

pom.xml

@@ -82,13 +82,6 @@
     -->
     <spotbugs.omitVisitors>FindReturnRef</spotbugs.omitVisitors>
 
-    <!-- Defines a SpotBugs threshold. Use "Low" to discover low-priority bugs.
-         Hint: SpotBugs considers some real NPE risks in Jenkins as low-priority issues, it is recommended to enable it in plugins.
-      -->
-    <spotbugs.threshold>Medium</spotbugs.threshold>
-    <!-- Defines a SpotBugs effort. Use "Max" to maximize the scan depth -->
-    <spotbugs.effort>Default</spotbugs.effort>
-
     <!-- Whether to skip tests during release phase (they are executed in the prepare phase). -->
     <release.skipTests>true</release.skipTests>
     <!-- By default we do not create *-tests.jar. Set to false to allow other plugins to depend on test utilities in yours, using <classifier>tests</classifier>. -->
@@ -691,9 +684,6 @@
       <plugin>
         <groupId>com.github.spotbugs</groupId>
         <artifactId>spotbugs-maven-plugin</artifactId>
-        <configuration>
-          <failOnError>${spotbugs.failOnError}</failOnError>
-        </configuration>
         <executions>
           <execution>
             <id>spotbugs</id>
@@ -706,8 +696,6 @@
               <!--  Instead we configure this in a profile -->
               <xmlOutput>true</xmlOutput>
               <spotbugsXmlOutput>false</spotbugsXmlOutput>
-              <effort>${spotbugs.effort}</effort>
-              <threshold>${spotbugs.threshold}</threshold>
             </configuration>
           </execution>
         </executions>