chore: add name of inventory script when echoing

Makes it more verbose and explicit where the log is comming from:

`Jul 30 11:01:43 qemux86-64 mender-update[53221]: mender-inventory-mender-configure: An authentication token could not be obtained over DBus`
instead of
`Jul 30 11:01:43 qemux86-64 mender-update[53221]: An authentication token could not be obtained over DBus`

Signed-off-by: Daniel Skinstad Drabitzius <daniel.drabitzius@northern.tech>

Author: danielskinstad

src/mender-inventory-mender-configure

@@ -42,11 +42,11 @@ AUTH_TOKEN="$(echo "$DBUS_REPLY" | sed -ne '1p')"
 SERVER="$(echo "$DBUS_REPLY" | sed -ne '2p')"
 
 if [ -z "$AUTH_TOKEN" ]; then
-    echo "An authentication token could not be obtained over DBus."
+    echo "mender-inventory-mender-configure: An authentication token could not be obtained over DBus."
     exit 1
 fi
 if [ -z "$SERVER" ]; then
-    echo "A server address could not be obtained over DBus."
+    echo "mender-inventory-mender-configure: A server address could not be obtained over DBus."
     exit 1
 fi