slapconfiguration: Add feature to get the instance state.

Change RewrtireRule in order to generate https url.

Add zope-username and zope-password options into the recipe erp5_bootstrap.
'zope-username' and 'zope-password' are harcoded on the buildout-side,
because the (https) 'zope-url' no longer include these informations.

(cherry picked from commit 9b3092348a4056e4c19caf4be01220d76da9fdbb)