Add loading spinner

Added a loading spinner that appears when set network settings are
confirmed. This fits with the other pages such as firmware update.

Tested: See the spinner when Save settings are confirmed.
Change-Id: Iec321e036ad7a81d960109397b3a60ffdf256062
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/configuration/controllers/network-controller.html b/app/configuration/controllers/network-controller.html
index 1d59b37..d237d47 100644
--- a/app/configuration/controllers/network-controller.html
+++ b/app/configuration/controllers/network-controller.html
@@ -1,3 +1,4 @@
+<loader loading="loading"></loader>
 <div id="configuration-network">
 	<div class="row column">
 		<h1>BMC network settings</h1>