-DspecsDir should use comma(,) as directory separator, not blank space

[carrchang]

Sometimes, name of directory contains blank space, if use blank space to separate multiple specs directories, will get wrong specs directory.

For example, use GoCD agent to run tests in Windows. Because GoCD agent is installed in directory C:\Program Files (x86)\Go Agent, so when setting specsDir to ${project.basedir}/src/test/resources/specs, will get message No specifications found in C:\Program, C:\Program Files (x86)\Go Agent\pipelines\ssc-suite-master\ssc-suite-master\ssc-cloud\Files, C:\Program Files (x86)\Go Agent\pipelines\ssc-suite-master\ssc-suite-master\ssc-cloud\(x86)\Go, C:\Program Files (x86)\Go Agent\pipelines\ssc-suite-master\ssc-suite-master\ssc-cloud\Agent\pipelines\ssc-suite-master\ssc-suite-master\ssc-cloud\src\test\resources\specs.

So, we should use comma(,) as directory separator.