RFR: JDK-8292064 Convert java/lang/management/MemoryMXBean shell tests to java version [v3]

[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 @build and move runs to separate tests.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9813/files
  - new: https://git.openjdk.org/jdk/pull/9813/files/75e7f722..b363daa3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9813&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9813&range=01-02

  Stats: 25 lines in 2 files changed: 22 ins; 2 del; 1 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