Added support for os-floating-ips extension

This commit adds support for the os-floating-ips extention. This allows
users to allocate and deallocate floating IPs as well as have instances
associate and disassociate floating IPs in a nova-network based cloud.
diff --git a/acceptance/openstack/compute/v2/floatingip_test.go b/acceptance/openstack/compute/v2/floatingip_test.go
new file mode 100644
index 0000000..ab7554b
--- /dev/null
+++ b/acceptance/openstack/compute/v2/floatingip_test.go
@@ -0,0 +1,107 @@
+// +build acceptance compute servers
+
+package v2
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rackspace/gophercloud"
+	"github.com/rackspace/gophercloud/acceptance/tools"
+	"github.com/rackspace/gophercloud/openstack/compute/v2/extensions/floatingip"
+	"github.com/rackspace/gophercloud/openstack/compute/v2/servers"
+	th "github.com/rackspace/gophercloud/testhelper"
+)
+
+func createFIPServer(t *testing.T, client *gophercloud.ServiceClient, choices *ComputeChoices) (*servers.Server, error) {
+	if testing.Short() {
+		t.Skip("Skipping test that requires server creation in short mode.")
+	}
+
+	name := tools.RandomString("ACPTTEST", 16)
+	t.Logf("Attempting to create server: %s\n", name)
+
+	pwd := tools.MakeNewPassword("")
+
+	server, err := servers.Create(client, servers.CreateOpts{
+		Name:      name,
+		FlavorRef: choices.FlavorID,
+		ImageRef:  choices.ImageID,
+		AdminPass: pwd,
+	}).Extract()
+	if err != nil {
+		t.Fatalf("Unable to create server: %v", err)
+	}
+
+	th.AssertEquals(t, pwd, server.AdminPass)
+
+	return server, err
+}
+
+func createFloatingIP(t *testing.T, client *gophercloud.ServiceClient) (*floatingip.FloatingIP, error) {
+	pool := os.Getenv("OS_POOL_NAME")
+	fip, err := floatingip.Create(client, &floatingip.CreateOpts{
+		Pool: pool,
+	}).Extract()
+	th.AssertNoErr(t, err)
+	t.Logf("Obtained Floating IP: %v", fip.IP)
+
+	return fip, err
+}
+
+func associateFloatingIP(t *testing.T, client *gophercloud.ServiceClient, serverId string, fip *floatingip.FloatingIP) {
+	err := floatingip.Associate(client, serverId, fip.IP).ExtractErr()
+	th.AssertNoErr(t, err)
+	t.Logf("Associated floating IP %v from instance %v", fip.IP, serverId)
+	defer func() {
+		err = floatingip.Disassociate(client, serverId, fip.IP).ExtractErr()
+		th.AssertNoErr(t, err)
+		t.Logf("Disassociated floating IP %v from instance %v", fip.IP, serverId)
+	}()
+	floatingIp, err := floatingip.Get(client, fip.ID).Extract()
+	th.AssertNoErr(t, err)
+	t.Logf("Floating IP %v is associated with Fixed IP %v", fip.IP, floatingIp.FixedIP)
+}
+
+func TestFloatingIP(t *testing.T) {
+	pool := os.Getenv("OS_POOL_NAME")
+	if pool == "" {
+		t.Fatalf("OS_POOL_NAME must be set")
+	}
+
+	choices, err := ComputeChoicesFromEnv()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	client, err := newClient()
+	if err != nil {
+		t.Fatalf("Unable to create a compute client: %v", err)
+	}
+
+	server, err := createFIPServer(t, client, choices)
+	if err != nil {
+		t.Fatalf("Unable to create server: %v", err)
+	}
+	defer func() {
+		servers.Delete(client, server.ID)
+		t.Logf("Server deleted.")
+	}()
+
+	if err = waitForStatus(client, server, "ACTIVE"); err != nil {
+		t.Fatalf("Unable to wait for server: %v", err)
+	}
+
+	fip, err := createFloatingIP(t, client)
+	if err != nil {
+		t.Fatalf("Unable to create floating IP: %v", err)
+	}
+	defer func() {
+		err = floatingip.Delete(client, fip.ID).ExtractErr()
+		th.AssertNoErr(t, err)
+		t.Logf("Floating IP deleted.")
+	}()
+
+	associateFloatingIP(t, client, server.ID, fip)
+
+}