Changes to support voltha-2.10 BBSim based jobs

Change-Id: I67032eb646531d3cdfb7d0c28834c7b7d065b641
diff --git a/vars/installVoltctl.groovy b/vars/installVoltctl.groovy
index d75beb1..dad20ff 100644
--- a/vars/installVoltctl.groovy
+++ b/vars/installVoltctl.groovy
@@ -6,6 +6,8 @@
     voltctlVersion = "1.6.11"
   } else if (branch == "voltha-2.9") {
     voltctlVersion = "1.7.4"
+  } else if (branch == "voltha-2.10") {
+    voltctlVersion = "1.7.6"
   } else {
     voltctlVersion = sh (
       script: "curl -sSL https://api.github.com/repos/opencord/voltctl/releases/latest | jq -r .tag_name | sed -e 's/^v//g'",