RFR: 8288895: LdapContext doesn't honor set referrals limit [v3]

[rmartinc]

> Fixes [JDK-8288895](https://bugs.openjdk.org/browse/JDK-8288895).
> 
> Any `LimitExceededException` now quits the referral loop.
> 
> Added class `ReferralLimitSearchTest`. It is a simple jtreg test which checks that `java.naming.ldap.referral.limit` is really enforced. The dummy ldap server always returns a referral for any search query. If the number of searches exceeds the limit, it throws an `IOException` and the test fails.
> 
> 
> make test TEST=jtreg:jdk/com/sun/jndi/ldap/ReferralLimitSearchTest.java

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

  8288895: LdapContext doesn't honor set referrals limit (typo)

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9256/files
  - new: https://git.openjdk.org/jdk/pull/9256/files/09961af7..81f3c146

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9256&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9256&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9256.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9256/head:pull/9256

PR: https://git.openjdk.org/jdk/pull/9256