Create API calls to Manage Blacklisted Domains

Add all API calls to manage blacklisted domains via a database.
Also, change the code to use the blacklisted domains from
the database and not from the config file.

bp/blacklist

Change-Id: I0fa08652cc0f15ab57708cd28413c43200e6d802

designate/exceptions.py

@@ -160,6 +160,10 @@ class DuplicateRecord(Duplicate):
     error_type = 'duplicate_record'
 
 
+class DuplicateBlacklist(Duplicate):
+    error_type = 'duplicate_blacklist'
+
+
 class NotFound(Base):
     error_code = 404
     error_type = 'not_found'
@@ -177,6 +181,10 @@ class TsigKeyNotFound(NotFound):
     error_type = 'tsigkey_not_found'
 
 
+class BlacklistNotFound(NotFound):
+    error_type = 'blacklist_not_found'
+
+
 class DomainNotFound(NotFound):
     error_type = 'domain_not_found'