RFR: CODETOOLS-7902702

[Dmitry Bessonov]

Adding centralized support for console logging using java.uti.logging API (since JT should be JavaSE 8 compatible)

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Commit messages:
 - 7902702: Add basic unified console logging support
 - (cleanup/refactoring) HTMLSection: added simple ::toString method
 - (cleanup/refactoring) HTML reporting classes: renaming vars/params for better readability
 - (cleanup/refactoring) HTMLReport: renaming vars for better readability

Changes: https://git.openjdk.java.net/jtharness/pull/3/files
 Webrev: https://webrevs.openjdk.java.net/jtharness/3/webrev.00
  Stats: 719 lines in 10 files changed: 551 ins; 1 del; 167 mod
  Patch: https://git.openjdk.java.net/jtharness/pull/3.diff
  Fetch: git fetch https://git.openjdk.java.net/jtharness pull/3/head:pull/3

PR: https://git.openjdk.java.net/jtharness/pull/3