[dts] dts support for executing case list in configuration file

[Tang, HaifengX]

Hi all :

In dts  configuration file , one test suite represent several test cases . but in  these test cases  , some  of them are not supported different NICs  simultaneously .
So we want to put the case list that all  supported one NIC  in configuration file.  Does  Anyone  have some advices and suggestions about it ?

Example case list configuration file as below:

[Execution1]
crbs=xxx.xxx.xxx.xxx
drivername=igb_uio
test_cases=
      hello_world_all_cores,
hello_world_single_core,
cmdline_sample_commands,
[....]
   checksum_checking,
   packet_checking
targets=
    x86_64-native-linuxapp-gcc
parameters=nic_type=niantic:func=true

Thanks,
Haifeng