[SPARK-7669] Builds against Hadoop 2.6+ get inconsistent curator depend…
[SPARK-7669] Builds against Hadoop 2.6+ get inconsistent curator depend…

This adds a new profile, `hadoop-2.6`, copying over the hadoop-2.4 properties, updating ZK to 3.4.6 and making the curator version a configurable option. That keeps the curator-recipes JAR in sync with that used in hadoop.

There's one more option to consider: making the full curator-client version explicit with its own dependency version. This will pin down the version from hadoop and hive imports

Author: Steve Loughran <stevel@hortonworks.com>

Closes #6191 from steveloughran/stevel/SPARK-7669-hadoop-2.6 and squashes the following commits:

e3e281a [Steve Loughran] SPARK-7669 declare the version of curator-client and curator-framework JARs
2901ea9 [Steve Loughran] SPARK-7669 Builds against Hadoop 2.6+ get inconsistent curator dependencies

(cherry picked from commit 50217667cc1239ed3b15f4d10907b727ed85d7fa)
Signed-off-by: Sean Owen <291c18f3fb7528c712d9098b0e50a515ea0b91d5@cloudera.com>

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