Use majek's fluxcapacitor to mock time in unittest

[thinkingfish]

So we can be less susceptible to clock drift and scheduler irregularities in the host in our time-sensitive tests, this causes the test to randomly fail about 10-20% of time, especially during peak travis hours.

Github Repo to depend on: https://github.com/majek/fluxcapacitor#fluxcapacitor

[majek]

ping me if I can help