Migrate endpoints during upgrade.

broker code for endpoint upgrade of gears

Fix unit tests.
card_169
bug 997924: jbossas-7 build fails if the app has mock-plugin addon
Merge pull request #4209 from mrunalp/dev/upgrade_endpoints

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Merge pull request #4204 from lnader/master

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Merge pull request #4210 from bparees/mock_error

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