datanucleus MultithreadedTest adopted for ZooDb. Generics test adopted. "One pm for many threads" test adopted.

[slavap]

Original version is here: https://github.com/datanucleus/tests/blob/master/jdo/general/src/test/org/datanucleus/tests/MultithreadedTest.java

[codecov-io]

Codecov Report

Merging #102 into master will increase coverage by 0.26%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #102      +/-   ##
============================================
+ Coverage     69.34%   69.61%   +0.26%     
- Complexity     4183     4199      +16     
============================================
  Files           158      158              
  Lines         17326    17326              
  Branches       2827     2827              
============================================
+ Hits          12015    12061      +46     
+ Misses         4410     4368      -42     
+ Partials        901      897       -4

Impacted Files	Coverage Δ	Complexity Δ
src/org/zoodb/internal/query/QueryParserV3.java	82.31% <0%> (+0.27%)	327% <0%> (+2%)	:arrow_up:
src/org/zoodb/internal/client/SchemaManager.java	84.94% <0%> (+1.07%)	70% <0%> (+1%)	:arrow_up:
src/org/zoodb/internal/server/StorageRootFile.java	67.85% <0%> (+2.38%)	17% <0%> (ø)	:arrow_down:
.../zoodb/jdo/impl/PersistenceManagerFactoryImpl.java	38.84% <0%> (+3.3%)	18% <0%> (+1%)	:arrow_up:
src/org/zoodb/jdo/spi/ZooStateInterrogator.java	44.44% <0%> (+4.44%)	11% <0%> (+1%)	:arrow_up:
src/org/zoodb/jdo/impl/ExtentImpl.java	83.78% <0%> (+8.1%)	15% <0%> (+2%)	:arrow_up:
...c/org/zoodb/internal/util/WeakIdentityHashMap.java	50.97% <0%> (+8.63%)	49% <0%> (+9%)	:arrow_up:

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