feat: 1.29 Deprecate redeem sub-command

* Card ID: CCT-400
* Modified short description of command
* Added warning that this command doesn't do anything, when
  SCA mode is used. When SCA mode is used, then display message
  returned form candlepin is also ignored.
* Modified description in manual page of subscription-manager

man/subscription-manager.8

@@ -610,7 +610,7 @@ Points to a certificate PEM file which contains the subscription certificate. Th
 .SS REDEEM OPTIONS
 The
 .B redeem
-command is used for systems that are purchased from third-party vendors that include a subscription. The redemption process essentially auto-attaches the preselected subscription that the vendor supplied to the system.
+command is deprecated, this command will be removed from the future major releases. This command is no-op, when simple content access mode is used. Command is used for systems that are purchased from third-party vendors that include a subscription. The redemption process essentially try to auto-attach the preselected subscription that the vendor supplied to the system.
 
 .TP
 .B --email=EMAIL
@@ -1352,7 +1352,7 @@ its existing subscriptions.
 .PP
 After registration, subscriptions on preconfigured systems can be claimed using the
 .B redeem
-command, which essentially auto-attaches the system to its preexisting subscriptions.
+command, which essentially try to auto-attach the system to its preexisting subscriptions.
 
 .RS
 .nf

src/subscription_manager/cli_command/redeem.py

@@ -26,7 +26,11 @@
 
 class RedeemCommand(CliCommand):
     def __init__(self):
-        shortdesc = _("Attempt to redeem a subscription for a preconfigured system")
+        shortdesc = _(
+            "Deprecated, this command will be removed from the future major releases."
+            " This command is no-op in simple content access mode."
+            " Attempt to redeem a subscription for a preconfigured system"
+        )
         super(RedeemCommand, self).__init__("redeem", shortdesc, False)
 
         self.parser.add_argument(