Change version of pom.xml to 2.4.9-SNAPSHOT
Merging 2.4 into 2.6
Fixes #3901: Fix node group display page
Merge pull request #311 from VinceMacBuche/bug_3901/fix_node_group_page

Fixes #3901: Fix Node group display page
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7