RFR(XS): 8205108: [testbug] Fix pattern matching in jstatd tests.

[Lindenmaier, Goetz]

Hi,

Please review this test fix:
http://cr.openjdk.java.net/~goetz/wr18/8205108-fixJstatDTestPattern/01/

The values for 'M' must be parsed as PERCENTAGE_OR_DASH. 
The parsing of numbers should not depend on the locale.
I changed the parsing to use java.text.NumberFormat

Best regards,
  Goetz.