Update protobuf dependency to 2.4.0a
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Key: HBASE-4233
URL: https://issues.apache.org/jira/browse/HBASE-4233
Project: HBase
Issue Type: Improvement
Reporter: Todd Lipcon
Hadoop trunk is using this version of protobufs, so the incompatibility makes
it impossible for HBase to coexist. We need to regenerate the code with 2.4.0a
and update the pom.
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