[MERGE #1452 @obastemur] runtests.py: default timeout for slow running tests 180 secs on *nix
[MERGE #1452 @obastemur] runtests.py: default timeout for slow running tests 180 secs on *nix

Merge pull request #1452 from obastemur:running_slow

Some of the tests (slow running) randomly fails on default timeout.
Although timeout can be set from command line for different set of runs,
it is convenient to have a bigger timeout for slow running tests

Affects `--include-slow` runs on unix/posix

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