Moved RBAC feature to Release6 folder

Change-Id: I65acf74bf74447c2045036d113b6088ca94b4a81
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/Release5/RBAC_improvements_in_NBI_with_Keystone.md b/Release6/RBAC_improvements_in_NBI_with_Keystone.md
similarity index 100%
rename from Release5/RBAC_improvements_in_NBI_with_Keystone.md
rename to Release6/RBAC_improvements_in_NBI_with_Keystone.md