[analyzer] Add -analyzer-config to scan-build.

-analyzer-config options are now passed from scan-build through to
ccc-analyzer and then to clang.

Patch by Daniel Connelly!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@197246 91177308-0d34-0410-b5e6-96231b3b80d8