Revert "[MSB]Update MSB docker images version to Guilin release"

This reverts commit 432b22cedb40fca649a075af93ab8f0076cdf9fc.

Reason for revert: So Distribution Error with this patch only

Issue-ID: MSB-537
Change-Id: Ia49ea36fa49148ff7437cd32e55292289197332b
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
diff --git a/kubernetes/msb/charts/msb-iag/values.yaml b/kubernetes/msb/charts/msb-iag/values.yaml
index a6cae0a..b1f19c9 100644
--- a/kubernetes/msb/charts/msb-iag/values.yaml
+++ b/kubernetes/msb/charts/msb-iag/values.yaml
@@ -23,7 +23,7 @@
 #################################################################
 # application image
 repository: nexus3.onap.org:10001
-image: onap/msb/msb_apigateway:1.2.8
+image: onap/msb/msb_apigateway:1.2.7
 pullPolicy: Always
 istioSidecar: true