Remove method get_ipv6_addr_by_EUI64

oslo_utils.netutils provides same method get_ipv6_addr_by_EUI64

Change-Id: Ibc615d652be4594748188170764adb5d9fd0473b
diff --git a/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml b/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml
new file mode 100644
index 0000000..609000c
--- /dev/null
+++ b/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Remove deprecated get_ipv6_addr_by_EUI64 method from data_utils.
+    Use the same method from oslo_utils.netutils.