qubes/tools: do not reject --set/--get in *-prefs tools

Those options are no longer needed, but lets not reject them to preserve
compatibility with older scripts

QubesOS/qubes-issues#2412

doc/manpages/qubes-prefs.rst

@@ -35,6 +35,14 @@ Options
 
    Unset the property. If is has default value, it will be used instead.
 
+.. option:: --get, -g
+
+   Ignored; for compatibility with older scripts.
+
+.. option:: --set, -s
+
+   Ignored; for compatibility with older scripts.
+
 
 Common properties
 =================

doc/manpages/qvm-prefs.rst

@@ -35,6 +35,14 @@ Options
 
    Unset the property. If is has default value, it will be used instead.
 
+.. option:: --get, -g
+
+   Ignored; for compatibility with older scripts.
+
+.. option:: --set, -s
+
+   Ignored; for compatibility with older scripts.
+
 
 Common properties
 =================

qubes/tools/qubes_prefs.py

@@ -39,6 +39,14 @@ parser = qubes.tools.QubesArgumentParser(
 parser.add_argument('--help-properties',
     action=qubes.tools.HelpPropertiesAction)
 
+parser.add_argument('--get', '-g',
+    action='store_true',
+    help='Ignored; for compatibility with older scripts.')
+
+parser.add_argument('--set', '-s',
+    action='store_true',
+    help='Ignored; for compatibility with older scripts.')
+
 parser.add_argument('property', metavar='PROPERTY',
     nargs='?',
     help='name of the property to show or change')

qubes/tools/qvm_prefs.py

@@ -42,6 +42,14 @@ parser.add_argument('--help-properties',
     action=qubes.tools.HelpPropertiesAction,
     klass=qubes.vm.qubesvm.QubesVM)
 
+parser.add_argument('--get', '-g',
+    action='store_true',
+    help='Ignored; for compatibility with older scripts.')
+
+parser.add_argument('--set', '-s',
+    action='store_true',
+    help='Ignored; for compatibility with older scripts.')
+
 parser.add_argument('property', metavar='PROPERTY',
     nargs='?',
     help='name of the property to show or change')