Add tokens so we can enable the uid during the build.

etc/arangodb3/arango-dfdb.conf.in

@@ -10,6 +10,7 @@ rest-server = false
 authentication = true
 # username = root
 # password = 
+@DEFINEUID@uid = arangodb
 
 statistics = false
 # set number of threads to 1 so we don't have concurrency

etc/arangodb3/arangod.conf.in

@@ -43,6 +43,9 @@ statistics = true
 # uid = arangodb
 # gid = arangodb
 
+@DEFINEUID@uid = arangodb
+
+
 [scheduler]
 # number of threads used for I/O, use 0 to make arangod determine
 # the number of threads automatically