Closes-Bug: #1607633 - Fixed the back-to-top link. On logout and login the click event was not getting bound.
Closes-Bug: #1607633 - Fixed the back-to-top link. On logout and login the click
event was not getting bound.

Change-Id: I673982f7ce882c3e8b8bf763d071f93f62fc3289

vishnuvv/contrail-web-core,biswajit-mandal/contrail-web-core,nagakiran/contrail-web-core,nagakiran/contrail-web-core,vishnuvv/contrail-web-core,biswajit-mandal/contrail-web-core,vishnuvv/contrail-web-core,biswajit-mandal/contrail-web-core,nagakiran/contrail-web-core