RFR: JDK-8261095: Add test for clhsdb "symbol" command [v2]

[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:

  Updated comments as per review and started using String.lines

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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/2ee7bd78..9d914d35

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2863&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2863&range=00-01

  Stats: 26 lines in 1 file changed: 1 ins; 7 del; 18 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