Adding os-services in blockstorage api

Change-Id: I6ded5a930c4d43288053014cb77a946732f37f12
diff --git a/openstack/blockstorage/extensions/os-services/requests.go b/openstack/blockstorage/extensions/os-services/requests.go
new file mode 100644
index 0000000..487e679
--- /dev/null
+++ b/openstack/blockstorage/extensions/os-services/requests.go
@@ -0,0 +1,13 @@
+package os_services
+
+import (
+	gophercloud "gerrit.mcp.mirantis.net/debian/gophercloud.git"
+	"gerrit.mcp.mirantis.net/debian/gophercloud.git/pagination"
+)
+
+// List returns a Pager that allows you to iterate over a collection of Network.
+func List(client *gophercloud.ServiceClient) pagination.Pager {
+	return pagination.NewPager(client, listURL(client), func(r pagination.PageResult) pagination.Page {
+		return OsServicePage{pagination.SinglePageBase(r)}
+	})
+}
diff --git a/openstack/blockstorage/extensions/os-services/results.go b/openstack/blockstorage/extensions/os-services/results.go
new file mode 100644
index 0000000..3c6bb04
--- /dev/null
+++ b/openstack/blockstorage/extensions/os-services/results.go
@@ -0,0 +1,24 @@
+package os_services
+
+import "gerrit.mcp.mirantis.net/debian/gophercloud.git/pagination"
+
+type OsService struct {
+	ID     string `json:"id"`
+	Host   string `json:"host"`
+	State  string `json:"state"`
+	Status string `json:"status"`
+	Zone   string `json:"zone"`
+	Binary string `json:"binary"`
+}
+
+type OsServicePage struct {
+	pagination.SinglePageBase
+}
+
+func ExtractOsServices(r pagination.Page) ([]OsService, error) {
+	var s struct {
+		OsServices []OsService `json:"services"`
+	}
+	err := (r.(OsServicePage)).ExtractInto(&s)
+	return s.OsServices, err
+}
diff --git a/openstack/blockstorage/extensions/os-services/urls.go b/openstack/blockstorage/extensions/os-services/urls.go
new file mode 100644
index 0000000..26d87ba
--- /dev/null
+++ b/openstack/blockstorage/extensions/os-services/urls.go
@@ -0,0 +1,7 @@
+package os_services
+
+import gophercloud "gerrit.mcp.mirantis.net/debian/gophercloud.git"
+
+func listURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL("os-services")
+}