Now that the transport client has been removed, the client transport
profile filter can be removed from security. This filter prevented node
actions from being executed using a transport client.
This commit removes the deprecated migrate tool which was used to
migrate users from the file realm to native realm when the native realm
was first created.
Removes the deprecated accept_default_password setting.
This setting become redundant when default passwords were removed
from 6.0, but the setting was kept for BWC.
Removes native role store cache settings.
These have been unused since 5.2 but were kept for BWC.