
Nova API supports change-since filter when list servers: https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/servers.py#L325-L331 but in python-novaclient we don't. This patch add the support for change-since when list servers. Closes-bug: #1551591 depends-on: Ic2f239f634f917a5771b0401a5073546c710c036 Change-Id: I27f2d1e33a56d357e247111b338c93861716cfee