cli: expose --only-cp in slapos node promise

The logic was here, but the argument was not registered

CHANGES.rst

 Changes
 =======
 
+1.9.1 (unreleased)
+------------------
+ * node promise: support --only-cp argument
+
 1.9.0 (2023-03-09)
 ------------------
  * format: add IPv6 range for partitions and tun

slapos/cli/slapgrid.py

@@ -181,9 +181,17 @@ class ReportCommand(SlapgridCommand):
     pidfile_option_name = 'pidfile_report'
 
 class PromiseCommand(SlapgridCommand):
-   """run only promises to test the parition state"""
+    """run only promises to test the partition state"""
 
     method_name = 'processPromiseList'
     default_pidfile = '/opt/slapos/slapgrid-cp.pid'
     pidfile_option_name = 'pidfile_instance'
 
+    def get_parser(self, prog_name):
+        ap = super(PromiseCommand, self).get_parser(prog_name)
+
+        ap.add_argument('--only-cp', '--only',
+                        help='Run promise for a single or a list of computer partitions '
+                             '(ie.:slappartX, slappartY), '
+                             'this option will make all other computer partitions be ignored.')
+        return ap
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