(build) fix JDK 16/17 builds

[bmarwell]

• Replaced a few EasyMock tests with Mockito where needed.
• --illegal-access=permit for guice tests.
• Remove JDK17-ea for now, no groovy support.

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[bmarwell]

The PR will only fail for JDK 11, but will work on JDK 8 and 14:

• https://ci-builds.apache.org/job/Shiro/job/Shiro-jdk8/view/change-requests/job/PR-278/
• https://ci-builds.apache.org/job/Shiro/job/Shiro-jdk11/view/change-requests/job/PR-278/ (that is this toggling test… works just sometimes.)
• https://ci-builds.apache.org/job/Shiro/job/Shiro-jdk14/view/change-requests/job/PR-278/

[bdemers]

a couple of minor nits, but looks good to me!

idea: we may want to make a note in the .github/template to look for conversions from easy-mock to mockito

(I'm not sure that's the best place for it) but it does bring focus to the effort (and adds a doc point as to why we are doing it). NOTE: that doesn't need to block this from getting merged though

[bdemers]

nit: add a comment as to why this is needed (to give us a hint when to remove it in the future)

[bdemers]

I'm guessing this works, but (if you haven't already) double-check to make sure the code coverage works (Jacoco sets the argLine prop too)

[bdemers]

delete the empty profile block?

[fpapon]

LGTM