The current RDT class and interface was define by the clos.py which is
mix get and merge RDT policy, create clos nodes.
Now we need call these interface to check the CLOS IDs number after
merged RDT policy, so this patch abstract the RDT interface to common
and add an assert to check the CLOS IDs number.
Tracked-On: #6690
Signed-off-by: Chenli Wei <chenli.wei@intel.com>
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
