GEODE-5996 Revert classgraph upgrade

The new version of classgraph adds parallelism (2 * core threads) for more
speed but can quickly consume large amounts of memory. Revert back
to version 4.0.6 until we decide how much parallelism is useful (in
particular the .scan(nThreads) API looks relevant),

geode-assembly/src/integrationTest/resources/assembly_content.txt

@@ -862,7 +862,7 @@ javadoc/stylesheet.css
 lib/HikariCP-3.2.0.jar
 lib/activation-1.1.1.jar
 lib/antlr-2.7.7.jar
-lib/classgraph-4.4.12.jar
+lib/classgraph-4.0.6.jar
 lib/commons-beanutils-1.9.3.jar
 lib/commons-codec-1.10.jar
 lib/commons-collections-3.2.2.jar

geode-assembly/src/integrationTest/resources/dependency_classpath.txt

@@ -20,7 +20,6 @@ shiro-crypto-core-1.4.0.jar
 shiro-lang-1.4.0.jar
 jetty-security-9.4.12.v20180830.jar
 lucene-queryparser-6.6.2.jar
-classgraph-4.4.12.jar
 slf4j-api-1.7.25.jar
 spring-core-4.3.20.RELEASE.jar
 jansi-1.17.1.jar
@@ -47,6 +46,7 @@ lucene-analyzers-phonetic-6.6.2.jar
 shiro-config-ogdl-1.4.0.jar
 jetty-http-9.4.12.v20180830.jar
 geode-protobuf-1.9.0-SNAPSHOT.jar
+classgraph-4.0.6.jar
 snappy-0.4.jar
 javax.resource-api-1.7.jar
 protobuf-java-3.6.1.jar

geode-core/src/test/resources/expected-pom.xml

@@ -278,7 +278,7 @@
     <dependency>
       <groupId>io.github.classgraph</groupId>
       <artifactId>classgraph</artifactId>
-      <version>4.4.12</version>
+      <version>4.0.6</version>
       <scope>compile</scope>
     </dependency>
     <dependency>

gradle/dependency-versions.properties

@@ -21,7 +21,7 @@ bcel.version = 6.2
 bouncycastle.version = 1.60
 carrotsearch.version = 2.5.0
 cglib.version = 3.2.9
-classgraph.version = 4.4.12
+classgraph.version = 4.0.6
 commons-beanutils.version = 1.9.3
 commons-collections.version = 3.2.2
 commons-configuration.version = 1.10