Fix live tests
Fix live tests

When setting up the environment for running live tests (on EC2), no default
series was specified. This meant that "precise" was used as a fallback to start
the bootstrap node. But later on, test asserts were being done with version.CurrentSeries(),
which in my case was "raring" since I'm running on the latest Ubuntu. So the tests failed.

Since we want series to be precise if not otherwise specified, I've changed the asserts in
some tests to check for version with series = config.DefaultSeries (ie "precise"). Another
change is than in the checkUpgrade() tests, the tools.Upload() was returning tools for
the series on which the tests are running. But we are only interested in the version
number. Rather than do a heavy weight solution to this like FORCE-VERSION, I just tweaked
the test code to set the series of the Upload() return value to match the expected series.
I think this is ok, but would like a 2nd opinon as I am not 100% sure of the exact
rational behind the FORCE-VERSION code.

I've also changed the TestBootstrapWithDefaultSeries test to account for the fact that
"precise" is the default series if not otherwise specified. I tweaked it so that whether
runnung on precise or otherwise, the default-series env parameter is always set to
something other than the series on which the tests are run.

R=fwereade, jameinel
CC=
https://codereview.appspot.com/8904043

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