OPENDJ-1114 Improve the debian package
 - Original data are copied under build/deb/ folder as the process to build the deb package implies to modify the source.
 - Opendj init script has been modified. Indeed, under debian OS (and others) the /var/run/ folder is deleted at reboot, deleting by the same way our pid  file, making the service wobbly.
 - As linux distro use the same opendj file, a new folder was created under resource to store the shared file between them.
 - At last, modified post/prem/specFile as well as the fact to create a symlink on an existing one throws an error. (same when you try to remove one from no-existing)