Adding a workaround for enabling steering in ConnectX-3 devices

This file will add this configuration
"options mlx4_core log_num_mgm_entry_size=-1" to
/etc/modprobe.d/mlx4.conf file in order to enable steering in
ConnectX-3 devices and then will rebuild the initramfs at the first
boot stage

Change-Id: Ia64e62e7fdb70e19be7b0a5cee163bd03c6de65d

firstboot/conntectx3_streering.yaml

@@ -0,0 +1,31 @@
+heat_template_version: queens
+
+description: >
+  This's a temporary workaround for adding this option
+  "log_num_mgm_entry_size=-1" to /etc/modprobe.d/mlx4.conf file in order to
+  allow steering in ConnectX-3 devices
+
+
+resources:
+  userdata:
+    type: OS::Heat::MultipartMime
+    properties:
+      parts:
+      - config: {get_resource: allow_steering}
+  allow_steering:
+    type: OS::Heat::SoftwareConfig
+    properties:
+      config: |
+        #!/bin/bash
+        set -x
+        echo "options mlx4_core log_num_mgm_entry_size=-1" >> /etc/modprobe.d/mlx4.conf
+        /sbin/dracut --force
+
+outputs:
+  # This means get_resource from the parent template will get the userdata, see:
+  # http://docs.openstack.org/developer/heat/template_guide/composition.html#making-your-template-resource-more-transparent
+  # Note this is new-for-kilo, an alternative is returning a value then using
+  # get_attr in the parent template instead.
+  OS::stack_id:
+    value: {get_resource: userdata}
+