s4:testprogs Operate the blackbox kinit and net tests using the :local config

s4:testprogs Operate the blackbox kinit and net tests using the :local config

This :local tells selftest.pl to use the local smb.conf for the test
environment, not the generic client smb.conf

This then makes the rest work properly - otherwise, it may attempt to
connect to the wrong KDC for example.

The only problem is that we can't test the 'net join' with this set,
so this is removed from the test.  The member server test environment
checks this anyway.

Andrew Bartlett