Guava upgrade

[timtay-microsoft]

Adding a proxy implementation to our code so that we can make some modifications so it is compatible with more recent guava versions. For the most part, this proxy implementation is equivalent to the dependency we previously took

All this proxy code now lives in the "tests/integration/com/microsoft/azure/sdk/iot/helpers/proxy" path.

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[abhipsaMisra]

Other than changing the guava dependency version, was there any other change required in the code that was copied over? Also, do we have the original sourcecode location documented somewhere so that we have a reference location to look at for any issues/updates etc. (if any)?

[drwill-ms]

Approved with the caveat that add more documentation about where we got the code from, why we copied it, what the license is, that we only use it for testing, etc.

[timtay-microsoft]

Other than changing the guava dependency version, was there any other change required in the code that was copied over? Also, do we have the original sourcecode location documented somewhere so that we have a reference location to look at for any issues/updates etc. (if any)?

There are some small changes made, so I've included a link to the Github repo that has the original source code.

[timtay-microsoft]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).