include jvm.test.junit.options into test configurations VM options

[wisechengyi]

Problem

Currently IntelliJ test configuration does not respect jvm options set up for test.junit configured in pants.ini

$ ./pants options | grep jvm.test.junit.options
jvm.test.junit.options = ['-Djava.awt.headless=true', '-Djava.net.preferIPv4Stack=true', '-Xmx2g', '-XX:MaxMetaspaceSize=512m'] (from CONFIG in pants.ini)

So when we create the run configurations, we should automatically add it, around https://github.com/pantsbuild/intellij-pants-plugin/blob/master/src/com/twitter/intellij/pants/components/impl/PantsProjectComponentImpl.java#L188

Interface to access pants options:
https://github.com/pantsbuild/intellij-pants-plugin/blob/master/common/com/twitter/intellij/pants/model/PantsOptions.java#L46