Disable creation of /dev/hugepages mount point

We create custom hugepages mount point for KVM/DPDK with custom
parameters (ownership flags/hugepages size). Need to disable default
mount point, because it can be unexpectedly used by DPDK.

Change-Id: Ibee95422213260e544406391c7a0922f1a41c5c2
Closes-Bug: PROD-14325

linux/system/hugepages.sls

@@ -40,3 +40,9 @@ hugepages_sysctl_vm_nr_hugepages:
 {%- endfor %}
 
 {%- endif %}
+
+# systemd always creates default mount point at /dev/hugepages
+# we have to disable it, as we configure our own mount point for DPDK.
+mask_dev_hugepages:
+  cmd.run:
+    - name: "systemctl mask dev-hugepages.mount"