ui: call logout before login to clear old sessionkey cookies (#4326)

This handle edge cases of upgrades and when legacy UI is used along with
Primate or any UI sharing cookies. The specific case it fixes involves
removal of duplicate sessionkey cookies.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

ui/scripts/cloudStack.js

@@ -280,6 +280,15 @@
 
                 var loginCmdText = array1.join("");
 
+                // Logout before login is called to purge any duplicate sessionkey cookies
+                // to handle edge cases around upgrades and using legacy UI with Primate
+                $.ajax({
+                    url: createURL('logout'),
+                    async: false,
+                    success: function() {},
+                    error: function() {}
+                });
+
                 $.ajax({
                     type: "POST",
                     data: "command=login" + loginCmdText + "&response=json",