[8u] 8217606: LdapContext#reconnect always opens a new connection

[Zhengyu Gu]

Hi,

I would like to backport this patch to 8u for Oracle 8u271 parity.

The original patch does not apply cleanly.

LdapCtx.java:
8u does not have 'reconnect' member, so removing the variable lines do 
not apply.

Reconnect.java:
Uses try-catch-with-resource statement, which does not exist in 8u. 
Converted to try-catch-finally.
Uses 'var' language feature, which does not exist in 8u. Converted 
accordingly.

BaseLdapServer.java:
The same issues as Reconnect.java, fixed accordingly.
Uses System.Logger, which does not exist in 8u. Converted to 
java.util.logging.Logger.

Original bug: https://bugs.openjdk.java.net/browse/JDK-8217606
Original patch: https://hg.openjdk.java.net/jdk/jdk/rev/6717d7e59db4

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8217606-8u/webrev.00/

Test:
   test/com/sun/jndi/ldap/LdapCtx/Reconnect.java

Thanks,

-Zhengyu