RFR: 8284673: Collapse identical catch branches in java.management [v2]

[Andrey Turbanov]

> Let's take advantage of Java 7 language feature - "Catching Multiple Exception Types".
> It simplifies code. Reduces duplication.
> Found by IntelliJ IDEA inspection Identical 'catch' branches in 'try' statement

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8284673: Collapse identical catch branches in java.management
  rename exc3 to exc2

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8161/files
  - new: https://git.openjdk.java.net/jdk/pull/8161/files/2dd8a18b..b6940625

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8161&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8161&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8161.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8161/head:pull/8161

PR: https://git.openjdk.java.net/jdk/pull/8161