GTNPORTAL-3370 - Added feature to restrict access to a node when outside publishing window

Added a new feature, to restrict access to a node if it's not inside of the publishing window.
This feature consists of:

* A new property (mixin) for the Node
* A new checkbox on the UI, close to the "publishing date" set of fields
* A new check on the UIPageActionListener, that displays the home page, should access to the node be restricted. This is so that the page has the same effect as of a "non existing node".
GTNPORTAL-3402 - Custom password policies

Added the capability of setting custom password policies. If the configuration entry "passwordpolicy" is found on the configuration, it's then used for the password validation. Otherwise, it fallsback to the previous behavior, which is to validate that a password has a minimum of 6 chars and maximum of 30 chars.

Added a method on the UserConfigurableValidator that lists the currently known configuration entries for this validator, and a test for that.
GTNPORTAL-3415: Fix LegacyRequestHandler to preserve the query string when redirecting to the login page
Fix gatein subsystem test failures on eap620