RFR: JDK-8078962: Add Open JDK copyright to PolynomialRoot.java test

[Alexander Kulyakhtin]

Hi,

Could you, please, review the copyright change in the file below?
There's no code changes, only the copyright has been changed.

CR: https://bugs.openjdk.java.net/browse/JDK-8078962 Add Open JDK copyright to PolynomialRoot.java test
Webrev: http://cr.openjdk.java.net/~akulyakh/8078962/webrev00/

Best regards,
Alexander