docker: ensure that abcl runs under a UTF-8 environment
The use of UTF-8 under docker depends on the commits to the inheriting container in <https://github.com/easye/openjdk8/commit/5fe27fdaf77bc9fa4007b7b60c92bae1de07baf3>. Comment out diagnostics listing all files in container at build time. Don't add a `java_home` setting as the easye/openjdk8 has already defaults pointing at the openjdk-8-jdk installation.
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