Fix accessibility issues in the java.management module

The following files in the java.management module have accessibility issues that need to be addressed.
src/java.management/share/classes/java/lang/management/LockInfo.java
src/java.management/share/classes/java/lang/management/ManagementFactory.java
src/java.management/share/classes/java/lang/management/ManagementPermission.java
src/java.management/share/classes/java/lang/management/MemoryNotificationInfo.java
src/java.management/share/classes/java/lang/management/MemoryUsage.java
src/java.management/share/classes/java/lang/management/MonitorInfo.java
src/java.management/share/classes/java/lang/management/RuntimeMXBean.java
src/java.management/share/classes/java/lang/management/ThreadInfo.java
src/java.management/share/classes/javax/management/Descriptor.java
src/java.management/share/classes/javax/management/DescriptorKey.java
src/java.management/share/classes/javax/management/MXBean.java
src/java.management/share/classes/javax/management/modelmbean/ModelMBeanAttributeInfo.java
src/java.management/share/classes/javax/management/modelmbean/ModelMBeanConstructorInfo.java
src/java.management/share/classes/javax/management/modelmbean/ModelMBeanInfo.java
src/java.management/share/classes/javax/management/modelmbean/ModelMBeanNotificationInfo.java
src/java.management/share/classes/javax/management/modelmbean/ModelMBeanOperationInfo.java
src/java.management/share/classes/javax/management/remote/JMXConnectionNotification.java