Code cleanup

* src/main/java/org/opends/quicksetup/QuickSetupLog.java
** Autorefactor'd file + reformat
** Rename static elements to uppercase
** Factorize code a bit

* src/main/java/org/opends/guitools/controlpanel/ui/BrowseSchemaPanel.java
** Autorefactor'ed file + Reformat
** Minor code cleanup
** Add final keyword
** Reduce visibility when it was possible
** Use straight return
** Use interface instead of concrete class for local variable which are collections
** Use ternary operator
** Format javadoc
** Add some generic statement to prevent warnings

* src/main/java/org/opends/guitools/controlpanel/task/DeleteSchemaElementsTask.java
** Consequences of cleanup done in BrowseSchemaPanel.java