Checkpoint for OPENDJ-1343 Migrate dsconfig
- Moved dsconfig package to opendj-config.
-> Several checkstyle errors still exist and will be fixed after this commit in order to let the changes on main files more readable.
-> BuildVersion.java will be renamed, moved later.


** DsConfig.java
- Added logger.
- Removed checkVersionMismatch and moved it to LDAPManagementContextFactory where the connection is opened.

** BuildVersion.java
- Added function to get the current configuration entry value of "cn=Version,cn=monitor"

** LDAPManagementContextFactory.java
- Added checkVersionMismatch.

**config.properties
- Added messages linked to BuildVersion.

** SDK *check* style modifications on :
- PropertyEditorModification.java
- PropertyValueEditor.java
- HelpSubCommandHandler.java
- SetPropSubCommandHandler.java
- SubCommandHandler.java
- ListSubCommandHandler.java
- CreateSubCommandHandler.java
- PropertyValuePrinter.java
- DeleteSubCommandHandler.java
- SubCommandHandlerFactory.java
- ArgumentExceptionFactory.java
- GetPropSubCommandHandler.java
- CLIProfile.java

** pom file : added dependency on opendj-cli.