[VOL-4415] Moved voltctl installation to its own keyword

Change-Id: Id58162b7a100efda715a837dc87959cdf4bf1307
diff --git a/vars/installVoltctl.groovy b/vars/installVoltctl.groovy
new file mode 100644
index 0000000..d81c9ed
--- /dev/null
+++ b/vars/installVoltctl.groovy
@@ -0,0 +1,20 @@
+# This keyword will install the voltctl based on the branch (e.g.: voltha-2.8 or master)
+def call(String branch) {
+  sh returnStdout: false, script: """
+    mkdir -p $WORKSPACE/bin
+    cd $WORKSPACE
+    if [ "${branch}" == "voltha-2.8" ]; then
+       VOLTCTL_VERSION=1.6.11
+    else
+       VOLTCTL_VERSION=\$(curl -sSL https://api.github.com/repos/opencord/voltctl/releases/latest | jq -r .tag_name | sed -e 's/^v//g')
+    fi
+    HOSTOS=\$(uname -s | tr "[:upper:]" "[:lower:"])
+    HOSTARCH=\$(uname -m | tr "[:upper:]" "[:lower:"])
+    if [ \$HOSTARCH == "x86_64" ]; then
+       HOSTARCH="amd64"
+    fi
+    curl -o $WORKSPACE/bin/voltctl -sSL https://github.com/opencord/voltctl/releases/download/v\${VOLTCTL_VERSION}/voltctl-\${VOLTCTL_VERSION}-\${HOSTOS}-\${HOSTARCH}
+    chmod 755 $WORKSPACE/bin/voltctl
+    voltctl version --clientonly
+  """
+}