Prepare QPS tests for running in GCE

Edit build.json to include qps tests and credentials
Perform required MOE edits for running qps tests in VM
Minor changes to underlying source files to support
issues like more restrictive warning flags in cloud.
	Change on 2014/12/17 by vpai <vpai@google.com>
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=82349829