Bump metallb version to 0.7.3

Change-Id: If15b39e6844368c67f6510e747d7b4fd5682ebd7
Related-PROD: PROD-21996
diff --git a/kubernetes/common.yml b/kubernetes/common.yml
index 639154e..f57b6e5 100644
--- a/kubernetes/common.yml
+++ b/kubernetes/common.yml
@@ -41,8 +41,8 @@
     kubernetes_genie_source: ${_param:kubernetes_genie_repo}/genie_v1.0-138-gbf5dbaa
     kubernetes_genie_source_hash: md5=b024052ed4ecb1d5354e0cc8f51afaca
     kubernetes_flannel_image: ${_param:kubernetes_flannel_repo}/flannel:v0.10.0-amd64
-    kubernetes_metallb_controller_image: ${_param:kubernetes_metallb_repo}/controller:v0.6.2
-    kubernetes_metallb_speaker_image: ${_param:kubernetes_metallb_repo}/speaker:v0.6.2
+    kubernetes_metallb_controller_image: ${_param:kubernetes_metallb_repo}/controller:v0.7.3
+    kubernetes_metallb_speaker_image: ${_param:kubernetes_metallb_repo}/speaker:v0.7.3
     kubernetes_sriov_source: ${_param:kubernetes_sriov_repo}/sriov_v0.3-8-g8b7ed98
     kubernetes_sriov_source_hash: md5=c0cc33202afd02e4cc44b977a8faf6e7
     kubernetes_cniplugins_source: ${_param:kubernetes_cniplugins_repo}/cni-plugins_v0.7.1-48-g696b1f9.tar.gz