Have AnalyzerOptions::getBooleanOption() stick the matching config

Have AnalyzerOptions::getBooleanOption() stick the matching config
string in the config table so that it can be dumped as part of the
config dumper.  Add a test to show that these options are sticking
and can be cross-checked using FileCheck.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164954 91177308-0d34-0410-b5e6-96231b3b80d8