Fixed a missing config paramters.


git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@188225 91177308-0d34-0410-b5e6-96231b3b80d8
More useful error message when command execution fails.


git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@188228 91177308-0d34-0410-b5e6-96231b3b80d8