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

The logic was here, but the argument was not registered
22 jobs for feat/promise-only-cp in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:14:57

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:16:33

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:15:22

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:25:56

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:34:23

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:19:45

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:16:04

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:19:13

failed SlapOS.Eggs.UnitTest-Jerome.Python2

00:16:01

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:16:35

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:17:31

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:28:31

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:15:56

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:13:58

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:14:25

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:16:55

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:16:25

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:27:21

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:15:22

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:16:17

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:16:30

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:17:52