Add floating IP qos_policy actions

Now we can associate a qos policy to the floating IP, and
dissociate it. The commands are:

  $ openstack floating ip create --qos-policy ...
  $ openstack floating ip set --qos-policy ...
  $ openstack floating ip set --no-qos-policy ...
  $ openstack floating ip unset --qos-policy

These commands are based on the neutron change:
I4efe9e49d268dffeb3df4de4ea1780152218633b

Partially-Implements blueprint: floating-ip-rate-limit

Change-Id: I932b32f78cc5a2b53926feaec1a0b392cf7e8b57

doc/source/cli/command-objects/floating-ip.rst

@@ -18,6 +18,7 @@ Create floating IP
         [--floating-ip-address <ip-address>]
         [--fixed-ip-address <ip-address>]
         [--description <description>]
+        [--qos-policy <qos-policy>]
         [--project <project> [--project-domain <project-domain>]]
         <network>
 
@@ -46,6 +47,12 @@ Create floating IP
     Set floating IP description
     *Network version 2 only*
 
+.. option:: --qos-policy <qos-policy>
+
+    QoS policy to attach to the floating IP (name or ID)
+
+    *Network version 2 only*
+
 .. option:: --project <project>
 
     Owner's project (name or ID)
@@ -154,6 +161,7 @@ Set floating IP properties
     openstack floating ip set
         --port <port>
         [--fixed-ip-address <ip-address>]
+        [--qos-policy <qos-policy> | --no-qos-policy]
         <floating-ip>
 
 .. option:: --port <port>
@@ -164,6 +172,14 @@ Set floating IP properties
 
     Fixed IP of the port (required only if port has multiple IPs)
 
+.. option:: --qos-policy <qos-policy>
+
+    Attach QoS policy to the floating IP (name or ID)
+
+.. option:: --no-qos-policy
+
+    Remove the QoS policy attached to the floating IP
+
 .. _floating_ip_set-floating-ip:
 .. describe:: <floating-ip>
 
@@ -193,12 +209,17 @@ Unset floating IP Properties
 
     openstack floating ip unset
         --port
+        --qos-policy
         <floating-ip>
 
 .. option:: --port
 
     Disassociate any port associated with the floating IP
 
+.. option:: --qos-policy
+
+    Remove the QoS policy attached to the floating IP
+
 .. _floating_ip_unset-floating-ip:
 .. describe:: <floating-ip>