Updated the locators as the UI moved to bastion name space.

All of the Alchemy name space changed into Bastion name space.

https://groups.google.com/forum/#!searchin/foreman-dev/bastion/foreman-dev/fU3ySm_9_50/M19ZWCzuLvEJ

NOTE:- There are many locator changes. So it's not possible for me to run each and every test and verify whether the changes are valid. So the fixes will happen further depending upon need, after a UI automation run is possible with upstream builds.