Develop test checking NMT and GC logs for being consistent.

There are at least two mechanisms of tracking memory usages in VM:
Native Memory Tracking (-XX:NativeMemoryTracking=summary -XX:+UnlockDiagnosticVMOptions -XX:+PrintNMTStatistics)
And GC logging (-Xloggc:gclog -XX:+PrintGCDetails)

There should be a test checking that two logs contain consistent data.

VMSQE test base used to contain tests of such type:
  metaspace/flags/compareGCLogAndNMT
  metaspace/flags/checkMetaspaceSize
But those tests were removed as result of fix of INTJDK-7610947.
If their original sources are attached.

The major reason, why they were removed - they failed due to (JDK-8011548 which was closed as will not fix) and it was not easy to fix those tests.

As stated in JDK-8011548, NMT2 will contain better diagnostic, so when NMT2 is implemented (planned within JDK9 scope) it will make sense to develop tests checking two logs for consistency.