update visualvm to 2.1.8

Vladimir Petkorequested to merge
vpa1977/visualvm:master into master

Changes:

  • import 2.1.6
  • import 2.1.8

Testing:

  • ppa build [2]
  • manual testing:
    • image
    • image

[1] https://github.com/openjdk/nashorn

[2] https://launchpad.net/~vpa1977/+archive/ubuntu/october-21/+sourcepub/15931640/+listing-archive-extra

Edited by Vladimir Petko

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