RFR: 7903659 Verify Problemlist contents [v4]

[Ludvig Janiuk]

> This change introduces the flag `-verifyexclude` which will run additional checks on the problemlists passes through `-exclude`. If any of the checks fails, jtreg prints a helpful message and refuses to start running tests.

Ludvig Janiuk has updated the pull request incrementally with one additional commit since the last revision:

  implement -match (made a method public)

-------------

Changes:
  - all: https://git.openjdk.org/jtreg/pull/181/files
  - new: https://git.openjdk.org/jtreg/pull/181/files/3bc90690..bb403ad6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=181&range=03
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=181&range=02-03

  Stats: 26 lines in 3 files changed: 23 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jtreg/pull/181.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/181/head:pull/181

PR: https://git.openjdk.org/jtreg/pull/181