RFR: JDK-8261095: Add test for clhsdb "symbol" command [v4]

[Vipin Sharma]

> JDK-8261095: Add test for clhsdb "symbol" command

Vipin Sharma has updated the pull request incrementally with one additional commit since the last revision:

  Moving filter call to next line for better formatting

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2863/files
  - new: https://git.openjdk.java.net/jdk/pull/2863/files/f7d50bd4..2a516c2b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2863&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2863&range=02-03

  Stats: 12 lines in 1 file changed: 1 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2863.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2863/head:pull/2863

PR: https://git.openjdk.java.net/jdk/pull/2863