Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/cmd_scsi.c b/common/cmd_scsi.c
index 8aae9fc..dd2c1ae 100644
--- a/common/cmd_scsi.c
+++ b/common/cmd_scsi.c
@@ -616,7 +616,7 @@
 
 U_BOOT_CMD(
 	scsi, 5, 1, do_scsi,
-	"scsi    - SCSI sub-system\n",
+	"SCSI sub-system",
 	"reset - reset SCSI controller\n"
 	"scsi info  - show available SCSI devices\n"
 	"scsi scan  - (re-)scan SCSI bus\n"
@@ -628,6 +628,6 @@
 
 U_BOOT_CMD(
 	scsiboot, 3, 1, do_scsiboot,
-	"scsiboot- boot from SCSI device\n",
+	"boot from SCSI device",
 	"loadAddr dev:part\n"
 );