Always source the kubespray-installer virtualenv

Change-Id: I8d0e2689a97b0a24b765640f21aae0b34e64b17a
diff --git a/kubespray-installer/setup.sh b/kubespray-installer/setup.sh
index aab3986..3491c2e 100755
--- a/kubespray-installer/setup.sh
+++ b/kubespray-installer/setup.sh
@@ -38,12 +38,16 @@
   if [ ! -x "ks_venv/bin/activate" ]
   then
     virtualenv ks_venv
+    # shellcheck disable=SC1091
+    source ks_venv/bin/activate
+
     pip install ansible==2.5.3
     pip install -r kubespray/requirements.txt
+  else
+    # shellcheck disable=SC1091
+    source ks_venv/bin/activate
   fi
 
-  # shellcheck disable=SC1091
-  source ks_venv/bin/activate
 
   # Generate inventory and var files
   echo "Generating The Inventory File"