app/testpmd: allow none shaper profile

app/testpmd: allow none shaper profile

Private shaper profiles are attached to nodes defined
in traffic manager hierarchy.

Since not every node must have a configured shaper
testpmd should allow setting shaper profile id to
invalid (RTE_TM_SHAPER_PROFILE_ID_NONE) easily.

This patch follows same approach as in case of setting
parent id of the root node i.e passing a negative value
sets node id to RTE_TM_NODE_ID_NULL.

In case of private shaper profile negative value will set
shaper profile id to RTE_TM_SHAPER_PROFILE_ID_NONE.

Signed-off-by: Tomasz Duszynski <tdu@semihalf.com>
Reviewed-by: Jasvinder Singh <jasvinder.singh@intel.com>