RFR: 8263688: Coordinate equals, hashCode and compareTo of JavacFileManager.PathAndContainer

[Pavel Rappo]

Please review this trivial change. Note that the change is not accompanied by a dedicated test. I don't think such a test would be warranted.

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Commit messages:
 - fix

Changes: https://git.openjdk.java.net/jdk/pull/3034/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3034&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263688
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3034.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3034/head:pull/3034

PR: https://git.openjdk.java.net/jdk/pull/3034