[DM]: Fix for reading DM private DB keyspace columns.

Currently DM invokes get_range() with column count 0.
This call does not return persisted ip-addresses.
Similar to this, ae id allocations also not read properly.
Fixed.

Change-Id: I37ad9dae8aec13a38cd810f15bc1265109c841b2
Closes-Bug: #1772160

src/config/device-manager/device_manager/db.py

@@ -1668,7 +1668,7 @@ def handle_pnf_resource_deletes(self, si_id_list):
 
     def init_pr_map(self):
         cf = self.get_cf(self._PR_VN_IP_CF)
-        pr_entries = dict(cf.get_range(column_count=0, filter_empty=False))
+        pr_entries = dict(cf.get_range(column_count=1000000))
         for key in pr_entries.keys():
             key_data = key.split(':', 1)
             cols = pr_entries[key] or {}
@@ -1680,7 +1680,7 @@ def init_pr_map(self):
 
     def init_pr_ae_map(self):
         cf = self.get_cf(self._PR_AE_ID_CF)
-        pr_entries = dict(cf.get_range(column_count=0, filter_empty=False))
+        pr_entries = dict(cf.get_range(column_count=1000000))
         for key in pr_entries.keys():
             key_data = key.split(':', 1)
             (pr_uuid, esi) = (key_data[0], key_data[1])