Allow tests to run in isolation.

E.g., 'bin/test --all -s Products.SiteAccess'.

src/Products/SiteAccess/__init__.py

-__doc__="""SiteAccess product"""
-
-import SiteRoot, AccessRule, VirtualHostMonster
-
+"""SiteAccess product
+"""
 def initialize(context):
+    import SiteRoot
+    import AccessRule
+    import VirtualHostMonster
+
     context.registerClass(instance_class=SiteRoot.SiteRoot,
       permission='Add Site Roots',
       constructors=SiteRoot.constructors, legacy=SiteRoot.constructors,
       icon='www/SiteRoot.gif')
+
     context.registerClass(instance_class=AccessRule.AccessRule,
       permission='Manage Access Rules', constructors=AccessRule.constructors,
       icon='www/AccessRule.gif')
+
     context.registerClass(instance_class=VirtualHostMonster.VirtualHostMonster,
       permission='Add Virtual Host Monsters',
       constructors=VirtualHostMonster.constructors,
       icon='www/VirtualHostMonster.gif')
+
     context.registerHelp()