RFR: 6766844: ByteArrayInputStream#read with a byte array of length 0 not consistent with InputStream when at EOF

[Brian Burkhalter]

Modify `java.io.ByteArrayInputStream` methods `read(byte[])` and `read(byte[],int,int)` to return zero per the `InputStream` specification when the byte array actual or specified length is zero.

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Commit messages:
 - 6766844: ByteArrayInputStream#read with a byte array of length 0 not consistent with InputStream when at EOF

Changes: https://git.openjdk.java.net/jdk/pull/4591/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4591&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6766844
  Stats: 16 lines in 2 files changed: 11 ins; 1 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4591.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4591/head:pull/4591

PR: https://git.openjdk.java.net/jdk/pull/4591