RFC: CACAO ignore all unknown options

[Xerxes Rånby]

CACAO currently do not pass most jtreg tests because CACAO stop on any 
unknown option, prints its usage, and then return with exit code: 1.

This are the main reason why CACAO make check-hotspot currently fails 
most of the tests: Test results: passed: 29; failed: 78

For example CACAO currently fail hotspot/test/compiler/7009359 due to 
the Unknown option: -Xbatch
command: main  -Xbatch -XX:+IgnoreUnrecognizedVMOptions 
-XX:+OptimizeStringConcat 
-XX:CompileCommand=exclude,Test7009359,mainTest7009359
----------System.out:(34/1763)----------
Unknown option: -Xbatch
Usage: cacao [-options] classname [arguments]
                (to run a class file)
...
----------System.err:(3/163)----------
Unknown -XX option: -XX:+IgnoreUnrecognizedVMOptions
Unknown -XX option: -XX:+OptimizeStringConcat
Unknown -XX option: -XX:CompileCommand=exclude,Test7009359,main
result: Failed. Unexpected exit from test [exit code: 1]


The attached patch fixes this by letting CACAO continue after it have 
reported the Unknown option to System.err.

Ok to push?


With this patch applied the remaining failing CACAO check-hotspot tests 
are now reduced to a handful, here testing on a amd64 box:

Error:  compiler/6589834/Test_ia32.java
FAILED: compiler/6987555/Test6987555.java
FAILED: compiler/6991596/Test6991596.java
FAILED: gc/6581734/Test6581734.java
FAILED: runtime/6626217/Test6626217.sh
FAILED: runtime/6929067/Test6929067.sh
FAILED: runtime/6981737/Test6981737.java

Test results: passed: 100; failed: 6; error: 1

Cheers
Xerxes
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