blocking_queue: add accessor for max queue size
blocking_queue: add accessor for max queue size

Change-Id: I94fbfc66d787f81e5b94da14c344df3e626a9f7b
Reviewed-on: http://gerrit.ent.cloudera.com:8080/14
Reviewed-by: Colin McCabe <3142ce8a0bdba4a38073365893e6b74f72d9c512@cloudera.com>
Tested-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>

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