Add the os-brick iSCSI API patch to the experimental series

Change-Id: If580d887d6d8538a8bb46e4642d64279a3503e19
diff --git a/patches/series.experimental b/patches/series.experimental
index 924837b..125c9ca 100644
--- a/patches/series.experimental
+++ b/patches/series.experimental
@@ -1,3 +1,4 @@
+openstack/os-brick/add-iscsi-api.patch
 openstack/cinder/sep-glance-upload-uri.patch
 openstack/cinder/sep-sp-cosmetic-comments.patch
 openstack/cinder/sep-sp-leave-it-to-brick.patch