RFR: 8265309: com/sun/jndi/dns/ConfigTests/Timeout.java fails with "Address already in use" BindException [v2]

[Aleksei Efimov]

> Hi,
> 
> `com/sun/jndi/dns/ConfigTests/Timeout.java ` was seen failing intermittently with "Address already in use" `BindException`. The reason of this failure is that `disconnect` call in JNDI `DnsClient` fails to rebind the datagram socket to the original port during `disconnect` call (the failure is in `DatagramChannel::repairSocket`).   
> Since Datagram socket is not reused and closed after the failure `finally` block with the `disconnect` call can be removed.
> 
> The fix was tested with all available JNDI/DNS tests, and no failures related to the change were observed.

Aleksei Efimov has updated the pull request incrementally with one additional commit since the last revision:

  Add bug id to Timeout.java jtreg header

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4227/files
  - new: https://git.openjdk.java.net/jdk/pull/4227/files/f3671fc5..82d026db

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4227&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4227&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4227.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4227/head:pull/4227

PR: https://git.openjdk.java.net/jdk/pull/4227