RFR: JDK-8292064 Convert java/lang/management/MemoryMXBean shell tests to java version [v2]

[Bill Huang]

> This task converts 5 shell tests below to java version. 
> test/java/lang/management/MemoryMXBean/LowMemoryTest2.sh 
> test/java/lang/management/MemoryMXBean/MemoryManagementParallelGC.sh 
> test/java/lang/management/MemoryMXBean/MemoryManagementSerialGC.sh 
> test/java/lang/management/MemoryMXBean/MemoryTestAllGC.sh 
> test/java/lang/management/MemoryMXBean/PendingAllGC.sh

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Removed GC settings.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9813/files
  - new: https://git.openjdk.org/jdk/pull/9813/files/2fa6e2f8..75e7f722

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9813&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9813&range=00-01

  Stats: 33 lines in 4 files changed: 0 ins; 31 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9813.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9813/head:pull/9813

PR: https://git.openjdk.org/jdk/pull/9813