RFR: JDK-8262944: Improve exception message when automatic module lists provider class not in JAR file [v2]

[Christian Stein]

> This commit appends the name of the JAR file to the exception message for when automatic module lists a non-existing provider class.

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Assert that only the name of the JAR file (without its path) is appended

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5543/files
  - new: https://git.openjdk.java.net/jdk/pull/5543/files/bb9762b8..5afba0bd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5543&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5543&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5543.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5543/head:pull/5543

PR: https://git.openjdk.java.net/jdk/pull/5543