RFR: 8323515: Create test alias "all" for all test roots [v2]

[Aleksey Shipilev]

> Since recent work to improve `tier4` performance, we actually test `tier{1,2,3,4}` often, which includes all the tests in current tree. It would be more convenient to just have the `all` test group/alias, so that we can do `make test TEST=all`. This also gives a parallelism / run time benefit, as we do not wait for tests in each tier to complete before moving to next tier. 
> 
> Sample run on out-of-the-box Linux x86_64 fastdebug is below. For some environments one also needs to supply a few keywords like `!printer` to skip tests that cannot complete without failure due to misconfiguration. I left the keywords as is to show how would a failing run look. There is also an existing shortcut in build system that allows to run this with `make test-all`.
> 
> 
> % make test TEST=all
> 
> Test selection 'all', will run:
> * jtreg:test/hotspot/jtreg:all
> * jtreg:test/jdk:all
> * jtreg:test/langtools:all
> * jtreg:test/jaxp:all
> * jtreg:test/lib-test:all
> 
> (...about 6 hours later...)
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>>> jtreg:test/hotspot/jtreg:all                       6731  6702    29     0 <<
>>> jtreg:test/jdk:all                                 9962  9951    11     0 <<
>    jtreg:test/langtools:all                           4469  4469     0     0   
>    jtreg:test/jaxp:all                                 513   513     0     0   
>    jtreg:test/lib-test:all                              32    32     0     0   
> ==============================
> TEST FAILURE

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  jdk_all and lib_test_all groups

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17422/files
  - new: https://git.openjdk.org/jdk/pull/17422/files/7f6797b6..78f5f9bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17422&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17422&range=00-01

  Stats: 8 lines in 2 files changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17422.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17422/head:pull/17422

PR: https://git.openjdk.org/jdk/pull/17422