Fix IBM J9 parser

[cmoetzing]

Scavenge collects were incorrectly marked as full gc. Concurrent collects resulted in a parse error. Tenured heap was displayed incorrectly due to missing timestamp.

[codecov-io]

Codecov Report

Merging #240 into develop will increase coverage by 0.04%. The diff coverage is 92.3%.

@@              Coverage Diff              @@
##             develop     #240      +/-   ##
=============================================
+ Coverage      70.49%   70.53%   +0.04%     
- Complexity      1522     1528       +6     
=============================================
  Files            146      146              
  Lines           8632     8641       +9     
  Branches        1392     1396       +4     
=============================================
+ Hits            6085     6095      +10     
+ Misses          1963     1961       -2     
- Partials         584      585       +1

Impacted Files	Coverage Δ	Complexity Δ
...er/view/renderer/ConcurrentGcBeginEndRenderer.java	40.74% <ø> (ø)	3 <0> (?)
...um/perf/gcviewer/ctrl/impl/GCViewerGuiBuilder.java	94.76% <100%> (ø)	6 <0> (ø)	:arrow_down:
...om/tagtraum/perf/gcviewer/view/ModelChartImpl.java	79.73% <100%> (ø)	38 <0> (ø)	:arrow_down:
.../tagtraum/perf/gcviewer/model/AbstractGCEvent.java	86.47% <88.23%> (+0.3%)	76 <7> (+2)	:arrow_up:
...gtraum/perf/gcviewer/imp/DataReaderIBM_J9_R28.java	84.66% <95%> (+0.86%)	51 <2> (+4)	:arrow_up:

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