RFR: JDK-8221164: jstatLineCounts tests need to be more resilient for NaN outputs

[gary.adams at oracle.com]

The M and CCS columns from jstat output can present a dash("-")
for NaN values, such as :

----------System.out:(13/1261)----------
   S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT    CGC    CGCT     GCT
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -      -      0    0.000     0    0.000     0    0.000    0.000
   0.00   0.00   0.00   0.00      -  28.19      1    0.571     0    0.000     0    0.000    0.571
   0.00 100.00   0.00  14.85  31.29  28.19      1    0.571     0    0.000     0    0.000    0.571
   0.00 100.00   0.00  14.85  31.29  28.19      1    0.571     0    0.000     0    0.000    0.571
   0.00 100.00   0.00  14.85  31.29  28.19      1    0.571     0    0.000     0    0.000    0.571


This proposed fix updates the awk scripts which are checking output lines.
For the M and CCS columns, allow either a floating point value or a dash.
e.g. "([0-9]+\.[0-9]+|-)"

   Webrev: http://cr.openjdk.java.net/~gadams/8221164/webrev/
   Issue:  https://bugs.openjdk.java.net/browse/JDK-8221164
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