RFR: 8248001: javadoc generates invalid HTML pages whose ftp:// links are broken

[Masanori Yano]

Could you please review the 8248001 bug fixes?

The problem is that javadoc generates invalid HTML pages whose ftp:// links are broken. The fix changes not to use protocol names directly, but to use regular expression.

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Commit messages:
 - 8248001: javadoc generates invalid HTML pages whose ftp:// links are broken
 - 8248001: javadoc generates invalid HTML pages whose ftp:// links are broken
 - 8248001: javadoc generates invalid HTML pages whose ftp:// links are broken

Changes: https://git.openjdk.java.net/jdk/pull/5198/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5198&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248001
  Stats: 324 lines in 5 files changed: 319 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5198.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5198/head:pull/5198

PR: https://git.openjdk.java.net/jdk/pull/5198