resulttool/manualexecution: Enable creation of test case configuration

resulttool/manualexecution: Enable creation of test case configuration

Allow the creation of test case configuration file based on user inputs.
Where this testcase configuration file will be used by the the manual
execution to run selected test cases for a module rather than compulsory
run all test cases in manual json file.

Signed-off-by: sangeeta jain <sangeeta.jain@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>