Merge pick up, tweaked role/site/plcore_base or os_manager path when OpenStack not present
diff --git a/planetstack/core/models/slice.py b/planetstack/core/models/slice.py
index 539be24..a4eb3a4 100644
--- a/planetstack/core/models/slice.py
+++ b/planetstack/core/models/slice.py
@@ -5,6 +5,7 @@
 from core.models import User
 from core.models import Role
 from core.models import DeploymentNetwork
+from openstack.manager import OpenStackManager
 
 # Create your models here.
 
@@ -12,14 +13,13 @@
     tenant_id = models.CharField(max_length=200, help_text="Keystone tenant id")
     name = models.CharField(unique=True, help_text="The Name of the Slice", max_length=80)
     enabled = models.BooleanField(default=True, help_text="Status for this Slice")
-    SLICE_CHOICES = (('plc', 'PLC'), ('delegated', 'Delegated'), ('controller','Controller'), ('none','None'))
-    instantiation = models.CharField(help_text="The instantiation type of the slice", max_length=80, choices=SLICE_CHOICES)
     omf_friendly = models.BooleanField()
     description=models.TextField(blank=True,help_text="High level description of the slice and expected activities", max_length=1024)
     slice_url = models.URLField(blank=True, max_length=512)
     site = models.ForeignKey(Site, related_name='slices', help_text="The Site this Node belongs too")
-    network_id = models.CharField(max_length=256, help_text="Quantum network")
-    router_id = models.CharField(max_length=256, help_text="Quantum router id")
+    network_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum network")
+    router_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum router id")
+    subnet_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum subnet id")
 
     SVC_CLASS_CHOICES = (('besteffort', 'Best Effort'), ('silver', 'Silver'), ('gold','Gold'))
     serviceClass = models.CharField(verbose_name="Service Class",default="besteffort",help_text="The Service Class of this slice", max_length=30, choices=SVC_CLASS_CHOICES)
@@ -28,11 +28,15 @@
     def __unicode__(self):  return u'%s' % (self.name)
 
     def save(self, *args, **kwds):
-        self.os_manager.save_slice(self)
+        if not hasattr(self, 'os_manager'):
+            setattr(self, 'os_manager', OpenStackManager())
+            self.os_manager.save_slice(self)
         super(Slice, self).save(*args, **kwds)
 
     def delete(self, *args, **kwds):
-        self.os_manager.delete_slice(self)
+        if not hasattr(self, 'os_manager'):
+            setattr(self, 'os_manager', OpenStackManager())
+            self.os_manager.delete_slice(self)
         super(Slice, self).delete(*args, **kwds)    
 
 class SliceMembership(PlCoreBase):
@@ -43,9 +47,13 @@
     def __unicode__(self):  return u'%s %s %s' % (self.slice, self.user, self.role)
 
     def save(self, *args, **kwds):
-        self.os_manager.driver.add_user_role(self.user.kuser_id, self.slice.tenant_id, self.role.role_type)
+        if not hasattr(self, 'os_manager'):
+            setattr(self, 'os_manager', OpenStackManager())
+            self.os_manager.driver.add_user_role(self.user.kuser_id, self.slice.tenant_id, self.role.role_type)
         super(SliceMembership, self).save(*args, **kwds)
 
     def delete(self, *args, **kwds):
-        self.os_manager.driver.delete_user_role(self.user.kuser_id, self.slice.tenant_id, self.role.role_type)
+        if not hasattr(self, 'os_manager'):
+            setattr(self, 'os_manager', OpenStackManager())
+            self.os_manager.driver.delete_user_role(self.user.kuser_id, self.slice.tenant_id, self.role.role_type)
         super(SliceMembership, self).delete(*args, **kwds)