[refactor] split out backend from couch database

First step of splitting classes across files on common.
backend.py holds SoledadBackend (generic backend logic)
couch/ is now a directory with old code inside __init__.py and
CouchServerState on state.py
Also removed mock IndexedSoledadBackend, since Soledad does not support
indexing due to encryption on server side.
Also fixed DesignDocUnknownError to show up what is the message of the
original exception. It was being lost.

1 files changed, 3 insertions, 3 deletions

diff --git a/server/pkg/create-user-db b/server/pkg/create-user-db
index a8ba3833..54856643 100755
--- a/server/pkg/create-user-db
+++ b/server/pkg/create-user-db
@@ -19,8 +19,8 @@ import os
 import sys
 import netrc
 import argparse
-from leap.soledad.common.couch import SoledadBackend
-from leap.soledad.common.couch import is_db_name_valid
+from leap.soledad.common.couch import CouchDatabase
+from leap.soledad.common.couch.state import is_db_name_valid
 from leap.soledad.common.couch import list_users_dbs
 from leap.soledad.server import load_configuration
 
@@ -69,7 +69,7 @@ def ensure_database(dbname):
         sys.exit(1)
     url = url_for_db(dbname)
     db_security = CONF['database-security']
-    db = SoledadBackend.open_database(url=url, create=True,
+    db = CouchDatabase.open_database(url=url, create=True,
                                      replica_uid=None, ensure_ddocs=True,
                                      database_security=db_security)
     print ('success! Ensured that database %s exists, with replica_uid: %s' %