RFR: 8261010: Delete the Netbeans "default" license header

Trivial cleanup, the "default" license header is removed in a few components. ------------- Commit messages: - Initial fix Changes: https://git.openjdk.java.net/jdk/pull/2368/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2368&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8261010 Stats: 14 lines in 3 files changed: 0 ins; 14 del; 0 mod Patch: https://git.openjdk.java.net/jdk/pull/2368.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2368/head:pull/2368 PR: https://git.openjdk.java.net/jdk/pull/2368