RFR [6943190] TEST_BUG: java/lang/Runtime/exec/ExecWithInput.java hardcodes path to cat

[Ivan Gerasimov]

Hello!

This is a friendly reminder.
Can someone with the Reviewer status please help review this?

In short: we have a few java tests that run shell commands.
In some tests the path to the command is omitted, in other tests an 
absolute path is given.
In the third group of tests, the *other* absolute path to the same 
commands is used.

As Martin suggested, I added searching for the command at certain fixed 
directories before using it.

The final webrev can be found here:
http://cr.openjdk.java.net/~igerasim/6943190/2/webrev/

Thanks in advance,
Ivan