[jdk11u-dev] RFR: 8365098: make/RunTests.gmk generates a wrong path to test artifacts on Alpine

[Roman Marchenko]

This is backport of "[JDK-8365098](https://bugs.openjdk.org/browse/JDK-8365098) make/RunTests.gmk generates a wrong path to test artifacts on Alpine" as JDK11 tests have the same issue on Alpine - generate a wrong path to test artifacts.

However, there are still vendors which still build jdk11 and below for Solaris, so I added the cross platfrom fix here, using a combination od SED and TR.

So, the backport isn't clean. (Build system fix, test artifacts path processing.)


I'm not sure, if I may request for integration as  a backport, or should I create new JBS bug to cover this (starting from the upstream).

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Commit messages:
 - cross-platform fix
 - Backport 41520998aa8808452ee384b213b2a77c7bad668d

Changes: https://git.openjdk.org/jdk11u-dev/pull/3125/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=3125&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365098
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/3125.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/3125/head:pull/3125

PR: https://git.openjdk.org/jdk11u-dev/pull/3125