Previously the context.xml files are deployed into META-INF folders
in each webapps. They now have been moved into <instance>/conf/
Catalina/localhost/<subsystem>.xml to allow further clean-up.

* Added RESTful servlet to add/remove a KRA connector from the CA.
* Modified ACL to allow KRA subsystem user to remove connector.
* Modified connector code to allow the connector to be replaced without a server restart.
* Added functionality to pki CLI to add/remove connector
* Added code to pkidestroy to remove the connector (using both pki CLI and sslget)
  When the issues with pki connection are resolved, we will use that method instead.
* Modified sslget to accept HTTP return codes != 200.  In this case, we were returning
  204 - which is perfectly legitimate.

Trac Ticket #466

Ticket 369

The realm authentication on certificate request REST services has
been enabled. Since now in the CLI the authentication is done using
a separate login operation, it is now possible to POST the approval
data without the problem related to chunked message.

Ticket #300

A REST account service has been added to allow client to login
to establish a session and to logout to destroy the session. This
way multiple operations can be executed using the same session
without having to re-authenticate.

Ticket #357