RFR: 8157555 com/sun/jdi/RedefineClearBreakpoint.sh times out due to Indify String Concat being slow in debug mode

[Staffan Larsen]

This is my second attempt at fixing this timeout by taking the jtreg timeout factor into account in the tests. The first fix [1] looked at the wrong environment variable, and also would have caused the test to run unnecessarily slow since it set sleep_seconds to a higher value instead of changing the timeout.

In this version I have tried to fix these problems. I now look at the env variable TESTTIMEOUTFACTOR which will contain the jtreg timeout factor in floating point notation. Since it is easier to work with integers in shell scripts, I truncate this value using and awk expression. I then use this value to set up time limits in the two places where we have them. To simplify the code in the cmd() function, I no longer print out stack traces after half the timeLimit, only when the limit has expired. I think this is reasonable.

bug: https://bugs.openjdk.java.net/browse/JDK-8157555 <https://bugs.openjdk.java.net/browse/JDK-8157555>webrev: http://cr.openjdk.java.net/~sla/8157555/webrev.00/ <http://cr.openjdk.java.net/~sla/8157555/webrev.00/>

Thanks,
/Staffan

[1] http://hg.openjdk.java.net/jdk9/hs-rt/jdk/rev/5a553039e9fc
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