RFR(S): 8165433: Convert Test_linked_list to Gtest

[Kirill Zhaldybin]

Dear all,

Could you please review this fix for 8165433?

The tests was separated into two -  for regular linked list and for 
sorted linked list, converted to Gtest, minor style changes implemented.

WebRev: http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8165433/webrev.00/
CR: https://bugs.openjdk.java.net/browse/JDK-8165433

Thank you.

Regards, Kirill