update prior to add repo

- update is required prior to adding to repo
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>

Change-Id: I1686942085016157755dae4e57b6e04efe769f7c
diff --git a/jenkins/common/install_common b/jenkins/common/install_common
index 3304bae..d844bdd 100755
--- a/jenkins/common/install_common
+++ b/jenkins/common/install_common
@@ -45,4 +45,4 @@
 
 curl $key_location | apt-key add -
 
-add-apt-repository -y "deb $REPOSITORY_BASE/$RELEASE $REPOSITORY SO UI RO osmclient openvim"
+apt update && add-apt-repository -y "deb $REPOSITORY_BASE/$RELEASE $REPOSITORY SO UI RO osmclient openvim"