Convert package.html files in `java.management` to package-info.java

The following packages have package.html files instead of package-info.java
package: java.lang.management
package: javax.management
package: javax.management.loading
package: javax.management.modelmbean
package: javax.management.monitor
package: javax.management.openmbean
package: javax.management.relation
package: javax.management.remote
package: javax.management.timer