make/RunTests.gmk has several commands like :

```
$(TR) -cs '[a-z][A-Z][0-9]\n' '[_*1000]'
```

I'm not sure what '[_*1000]' is supposed to do, I guess it doesn't work as expected, regardless it's ok on most Linux.

Anyway, on Linux Alpine, at least alpine 3.11, it generates incorrect folder name, like "jtreg]test]hotspot]jtreg]tier1]common" instead of "jtreg_test_hotspot_jtreg_tier1_common".

```
TEST=test/hotspot/jtreg/:tier1_common
+ /usr/bin/make test-prebuilt
Detected target OS, type and env: [linux] [unix] [linux]
Running tests using JTREG control variable 'JAVA_OPTIONS=-XX:-CreateCoredumpOnCrash;VERBOSE=fail,error,time;KEYWORDS=!headful'
Test selection 'test/hotspot/jtreg/:tier1_common', will run:
* jtreg:test/hotspot/jtreg:tier1_common
Clean up dirs for jtreg]test]hotspot]jtreg]tier1]common
...
Report written to user_build/run-test-prebuilt/test-results/jtreg]test]hotspot]jtreg]tier1]common/html/report.html
Results written to user_build/run-test-prebuilt/test-support/jtreg]test]hotspot]jtreg]tier1]common
Finished running test 'jtreg:test/hotspot/jtreg:tier1_common'
Test report is stored in build/run-test-prebuilt/test-results/jtreg]test]hotspot]jtreg]tier1]common
```

This affects the upstream and all versions down below, except jdk8.