OPENDJ-2232 Fix OpenDJ trunk to use Git
* pom.xml
** Update to parent-2.0.3
** Update scm urls to git repos
* org/opends/server/util/DynamicConstants
** REVISION_NUMBER is now a String which is the SHA-1 of the last commit
* org/opends/server/util/BuildVersion
** Consequences of changes done in DynamicConstants
** Tie-breaker comparison on revision number is now meaningless since we do not support nightly-builds upgrades (see OPENDJ-2232)
** Add a constructor with only major.minor.point
* Other changes are consequences of modifications described below