Fix data races in tests
Fix data races in tests

- dropsonde/metrics uses global variable that we were setting in a
  BeforeEach before every test
- When testing ifrit Runner, the TokenFetchReturns method was being used
  inside of It block while Runner was started in a BeforeEach.

Signed-off-by: Mark St.Godard <c658bdde7d0e2722483697104148a0afc73ce15b@gmail.com>

dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,ryan-talley/cf-bigip-ctlr,dramich/cf-bigip-ctlr,dramich/cf-bigip-ctlr