Add missing exceptions import #159 to Core

Author: OffBy0x01

blackduck/Core.py

@@ -4,6 +4,8 @@
 from operator import itemgetter
 import urllib.parse
 
+from .Exceptions import UnknownVersion, CreateFailedAlreadyExists, CreateFailedUnknown
+
 logger = logging.getLogger(__name__)
 
 def read_config(self):