disable ptest default and add info to local.conf

We are restricting the ptest default distro feature
and adding the ptest related info in local.conf.sample
to use ptest.

Signed-off-by: Shrikant Bobade <Shrikant_Bobade@mentor.com>
Merge pull request #68 from sbobade/ptestdetermineaddlocalconf

disable ptest default and add info to local.conf