DNS lists lower case only

Converted DNS lists to lower case only and removed duplicates
without chaing order

fix #553

Discovery/DNS/deepmagic.com-prefixes-top500.txt

@@ -1,4 +1,4 @@
-reserved-multicast-range-NOT-delegated
+reserved-multicast-range-not-delegated
 nothing
 dynamic
 static
@@ -16,18 +16,18 @@ pool
 fios
 dyn
 vodacom
-staticIP
+staticip
 east
 fbx
 adsl
 bigpond
 client
-HINET-IP
+hinet-ip
 customer
 home
 biz
 us
-dynamicIP
+dynamicip
 ucom
 4k
 mc
@@ -276,7 +276,7 @@ ed
 bhm
 domolink
 savecom
-Unused
+unused
 ts
 clsp
 austin