move migrators to lbrynet.database, remove lbrynet.db_migrator

lbrynet/database/migrator/dbmigrator.py

@@ -5,20 +5,23 @@ def migrate_db(db_dir, start, end):
     current = start
     while current < end:
         if current == 1:
-            from lbrynet.db_migrator.migrate1to2 import do_migration
+            from lbrynet.database.migrator.migrate1to2 import do_migration
             do_migration(db_dir)
         elif current == 2:
-            from lbrynet.db_migrator.migrate2to3 import do_migration
+            from lbrynet.database.migrator.migrate2to3 import do_migration
             do_migration(db_dir)
         elif current == 3:
-            from lbrynet.db_migrator.migrate3to4 import do_migration
+            from lbrynet.database.migrator.migrate3to4 import do_migration
             do_migration(db_dir)
         elif current == 4:
-            from lbrynet.db_migrator.migrate4to5 import do_migration
+            from lbrynet.database.migrator.migrate4to5 import do_migration
+            do_migration(db_dir)
+        elif current == 5:
+            from lbrynet.database.migrator.migrate5to6 import do_migration
             do_migration(db_dir)
         else:
-            raise Exception(
+            raise Exception("DB migration of version {} to {} is not available".format(current,
-                "DB migration of version {} to {} is not available".format(current, current+1))
+                                                                                       current+1))
         current += 1
     return None