Incorrect license on Token verifier

[rafaelmenta]

TokenVerifier class and its test class both have the Apache license instead of BSD 3

Environment details

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Steps to reproduce

https://github.com/googleapis/google-auth-library-java/blob/master/oauth2_http/java/com/google/auth/oauth2/TokenVerifier.java

https://github.com/googleapis/google-auth-library-java/blob/master/oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java

Stacktrace

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Code snippet

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External references such as API reference guides used

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Any additional information below

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[chingor13]

Fixed in #461