UnitTestFrameworkPkg: Add configuration for Ecc check in yaml file
    
    Add configuration ExceptionList and IgnoreFiles for package config
    files. So users can rely on this to ignore some Ecc issues.
    Besides, add submodule path in IgnoreFiles section.
    
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Cc: Sean Brogan <sean.brogan@microsoft.com>
    Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
    Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
    Reviewed-by: Liming Gao <liming.gao@intel.com>
    Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>