Merge branch 'doc-persistent_session_where' into 'v2.0'

Add samples to filter persistent sessions

See merge request !191

lemonldap-ng-common/scripts/lemonldap-ng-sessions

@@ -167,8 +167,11 @@ Examples
 	lemonldap-ng-sessions search --where uid=dwho \
 		--id-only
 
+	lemonldap-ng-sessions search --backend persistent \
+		--where _session_uid=dwho
+
 	lemonldap-ng-sessions search --where uid=dwho \
-		 --select authenticationLevel
+		--select authenticationLevel
 
 =head2 Delete
 
@@ -191,6 +194,8 @@ Examples:
 
 	lemonldap-ng-sessions delete --where uid=dwho
 
+	lemonldap-ng-sessions delete --persistent --where _session_uid=dwho
+
 =head2 Set Key
 
     lemonldap-ng-sessions setKey <id> <key> <value> [<key> <value> ...]