[1.7>master] [MERGE #3564 @dilijev] Fix space between , and exclude_xplat (rl doesn't handle spaces)
[1.7>master] [MERGE #3564 @dilijev] Fix space between , and exclude_xplat (rl doesn't handle spaces)

Merge pull request #3564 from dilijev:fix_test_tag

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore