RFR: 8307653: Adjust delay time and gc log argument in TestAbortOnVMOperationTimeout

[Guoxiong Li]

Hi all,

This patch increases the delay time of the test `TestAbortOnVMOperationTimeout` 
so that it can pass on the low performance devices (such as my local riscv64 dev board).

And I adjust the gc log options to get more gc log message which is useful to
inspect the issue [JDK-8296819](https://bugs.openjdk.org/browse/JDK-8296819).

Thanks for the review.

Best Regards,
-- Guoxiong

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

Commit messages:
 - JDK-8307653

Changes: https://git.openjdk.org/jdk/pull/13878/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13878&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307653
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13878.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13878/head:pull/13878

PR: https://git.openjdk.org/jdk/pull/13878