RFR: 7903095: Use diamond operator in jtreg [v2]

[Christian Stein]

> Update jtreg to use the diamond operator to eliminate reduct use of type arguments.

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Avoid `<>` with anonymous inner classes

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Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/52/files
  - new: https://git.openjdk.java.net/jtreg/pull/52/files/1114ada9..cfabb5cd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=52&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=52&range=00-01

  Stats: 17 lines in 1 file changed: 1 ins; 7 del; 9 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/52.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/52/head:pull/52

PR: https://git.openjdk.java.net/jtreg/pull/52