VOL-2727: Only attempt to add tcont/gem if its actually new

When adding the tcont or gem to the handler
pon cache return true or false if its actually unique
and added to the cache.  This prevents the tp task
from adding potentially the same alloc id to a different
tcont id

Also remove unused code.

Change-Id: Iee1b7698c84b0790c624fe67c32b6ea215c8eab5
diff --git a/python/adapters/brcm_openomci_onu/pon_port.py b/python/adapters/brcm_openomci_onu/pon_port.py
index f644ec8..634fd7e 100644
--- a/python/adapters/brcm_openomci_onu/pon_port.py
+++ b/python/adapters/brcm_openomci_onu/pon_port.py
@@ -171,32 +171,14 @@
         """
 
         if not self._valid:
-            return  # Deleting
+            return False # Deleting
 
         if not reflow and tcont.alloc_id in self._tconts:
-            return  # already created
+            return False # already created
 
         self.log.info('add-tcont', tcont=tcont.alloc_id, reflow=reflow)
         self._tconts[tcont.alloc_id] = tcont
-
-    def update_tcont_td(self, alloc_id, new_td):
-
-        tcont = self._tconts.get(alloc_id)
-
-        if tcont is None:
-            return  # not-found
-
-        tcont.traffic_descriptor = new_td
-
-        # TODO: Not yet implemented
-        # TODO: How does this affect ONU tcont settings?
-        # try:
-        #    results = yield tcont.add_to_hardware(self._handler.omci)
-        # except Exception as e:
-        #    self.log.exception('tcont', tcont=tcont, e=e)
-        #    # May occur with xPON provisioning, use hw-resync to recover
-        #    results = 'resync needed'
-        # returnValue(results)
+        return True
 
     @inlineCallbacks
     def remove_tcont(self, alloc_id, remove_from_hw=True):
@@ -234,15 +216,16 @@
         """
 
         if not self._valid:
-            return  # Deleting
+            return False # Deleting
 
         if not reflow and (gem_port.gem_id, gem_port.direction) in self._gem_ports:
-            return  # nop
+            return False # nop
 
         # The gem_port entity id is set to be same as gem_id
         gem_port.entity_id = gem_port.gem_id
         self.log.info('add-gem-port', gem_port=gem_port, reflow=reflow)
         self._gem_ports[(gem_port.gem_id, gem_port.direction)] = gem_port
+        return True
 
     @inlineCallbacks
     def remove_gem_id(self, gem_id, direction, remove_from_hw=True):