Add driver names to a few flag descriptions to make is consistent

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

drivers/google/google.go

@@ -65,7 +65,7 @@ func GetCreateFlags() []cli.Flag {
 		},
 		cli.StringFlag{
 			Name:   "google-username",
-			Usage:  "User Name",
+			Usage:  "GCE User Name",
 			Value:  "docker-user",
 			EnvVar: "GOOGLE_USERNAME",
 		},

drivers/hyperv/hyperv_windows.go

@@ -48,24 +48,24 @@ func GetCreateFlags() []cli.Flag {
 	return []cli.Flag{
 		cli.StringFlag{
 			Name:  "hyper-v-boot2docker-url",
-			Usage: "The URL of the boot2docker image. Defaults to the latest available version.",
+			Usage: "Hyper-V URL of the boot2docker image. Defaults to the latest available version.",
 		},
 		cli.StringFlag{
 			Name:  "hyper-v-boot2docker-location",
-			Usage: "Local boot2docker iso. Overrides URL.",
+			Usage: "Hyper-V local boot2docker iso. Overrides URL.",
 		},
 		cli.StringFlag{
 			Name:  "hyper-v-virtual-switch",
-			Usage: "Name of virtual switch. Defaults to first found.",
+			Usage: "Hyper-V virtual switch name. Defaults to first found.",
 		},
 		cli.IntFlag{
 			Name:  "hyper-v-disk-size",
-			Usage: "Size of disk for host in MB.",
+			Usage: "Hyper-V disk size for host in MB.",
 			Value: 20000,
 		},
 		cli.IntFlag{
 			Name:  "hyper-v-memory",
-			Usage: "Size of memory for host in MB.",
+			Usage: "Hyper-V memory size for host in MB.",
 			Value: 1024,
 		},
 	}

drivers/openstack/openstack.go

@@ -176,7 +176,7 @@ func GetCreateFlags() []cli.Flag {
 		// the BoolFlag default value is always false
 		cli.StringFlag{
 			Name:  "openstack-docker-install",
-			Usage: "Set if docker have to be installed on the machine",
+			Usage: "Openstack should install docker on the machine",
 			Value: "true",
 		},
 	}