RFR (M): 8164546: Convert DirectivesParser_test to GTest

[Pavel Punegov]

Hi,

please review this change that rewrites a native test to Gtest framework.
The fix removes test methods from the DirectiveParser and makes test cases use DirectiveParser::parse_string method instead.
The original test was written by Nils Eliasson.

webrev: http://cr.openjdk.java.net/~ppunegov/8164546/webrev.02/ <http://cr.openjdk.java.net/~ppunegov/8164546/webrev.02/>
bug: https://bugs.openjdk.java.net/browse/JDK-8164546 <https://bugs.openjdk.java.net/browse/JDK-8164546>
— Thanks,
Pavel Punegov

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