Change for the 'running_in_container' check

This commit change check of 'running_in_container'
method so that other services ironic, nova and neutron
will not break.

Change-Id: I42eb587cfaebf37944cb10e459b8b8f7b4b4e4ba
diff --git a/functions b/functions
index 4435f2d..872f216 100644
--- a/functions
+++ b/functions
@@ -666,11 +666,7 @@
 
 # running_in_container - Returns true otherwise false
 function running_in_container {
-    if [[ $(systemd-detect-virt --container) == 'none' ]]; then
-        return 0
-    fi
-
-    return 1
+    [[ $(systemd-detect-virt --container) != 'none' ]]
 }