Flappy test TestJoinHandlerNotMakingAlive

[dansimau]

--- FAIL: TestJoinHandlerNotMakingAlive (0.05s)
    Error Trace:    node_bootstrap_test.go:110
    Error:      Should be false
    Messages:   didn't expect the bootstapping node to appear in the member list of any peers

    Error Trace:    node_bootstrap_test.go:111
    Error:      Should be false
    Messages:   didn't expect existing node to have changes

--- FAIL: TestBootstrapTestSuite (0.47s)

Have received this a couple of times now on separate branches.

[dansimau]

• This test is new since v0.2.3
• It looks like a bug in the test: the test is not waiting for convergence after a bootstrap call before it does the assertions