Rebalance failure on Windows (spock)

Ritam - assigning to you for triaging.

The spock sanity on windows (4 nodes) is failing a majority of times. You can see the build history here: http://server.jenkins.couchbase.com/view/build-sanity/job/build_sanity_matrix/DISTRO=win64,TYPE=4node/

Here are the 3 scenarios

• There are occasional uninstall issues where testrunner install script tries to uninstall the previously installed version and it fails (haven't figured out if that is an issue yet). (eg, 4.7.0-931)
• Occasionally the sanity test passes (eg, 4.7.0-927, 4.7.0-930)
• This bug is about the third category where occasionally the swap rebalance test is failing (I am going to assume for now that rest of the test failures are a result of this test failure and having the cluster in a bad state)
  Eg: http://server.jenkins.couchbase.com/view/build-sanity/job/build_sanity_matrix/DISTRO=win64,TYPE=4node/1676/

As noted, there are times the tests are passing. So it is quite likely an intermittent crash or something.