[#1502] Remove "{User} has been logged in" flash message

Fixes #1502.
Merge branch 'master' of github.com:ckan/ckan into 1502-remove-logged-in-flash-message
[#1502] Delete breaking asserts
Merge pull request #1502 from ckan/1502-remove-logged-in-flash-message

"{User} has been logged in" flash message is pointless