Adding GUI login/logout capability using form-based login.

Adding REST API login capability using basic authentication.

HTTP to HTTPS redirect is suppressed for now.

Change-Id: I1a98bdc5576c515e1aa5a1b8d66402af0c0bf8c8
diff --git a/web/gui/src/main/webapp/app/fw/mast/mast.html b/web/gui/src/main/webapp/app/fw/mast/mast.html
index a5ddbc6..5bb488a 100644
--- a/web/gui/src/main/webapp/app/fw/mast/mast.html
+++ b/web/gui/src/main/webapp/app/fw/mast/mast.html
@@ -3,4 +3,4 @@
      ng-click="mastCtrl.toggleNav()"></div>
 <img class="logo" src="data/img/onos-logo.png">
 <span class="title">Open Network Operating System</span>
-<div id="mast-right"></div>
+<div id="mast-right"><a href="rs/logout">logout</a></div>