RFR: JDK-8214710 Fix hg log in update_copyright_year.sh

Mon Dec 3 16:15:29 UTC 2018

The commands for hg log is missing -l1, which will limit the log to just the revision specified. Instead, all revisions from repo creation will now be included, and the script fails to work.

I will publish a separate changeset with missed copyright year updates in the build system.

Bug: https://bugs.openjdk.java.net/browse/JDK-8214710
WebRev: http://cr.openjdk.java.net/~ihse/JDK-8214710-fix-update-copyright-year/webrev.01

/Magnus