Fix unstable tests

[stansv]

This issue is to track unstable tests (collected from travis build logs https://travis-ci.org/taskforcesh/bullmq)

Pause
  should be able to pause a running queue and emit relevant events

• timeout (Node process not exiting #159.3, QueueBase#waitUntilReady to be deprecated? #161.1, QueueBase#waitUntilReady to be deprecated? #161.2, fix(sandbox): If the child process is killed, remove it from the pool. #162.3, fix(sandbox): If the child process is killed, remove it from the pool. #162.1, How to notify an user that the job is done and return the results #163.2, How to notify an user that the job is done and return the results #163.3, Possible memory leak in workers. #167.3, fix: removed deprecated and unused node-uuid #170.2, fix: removed deprecated and unused node-uuid #170.3)

Compat
  events
    emits drained and global:drained event when all jobs have been processed

• timeout (Job.fromId String Parameter Contradicts Method Comment/Implementation #134.3)

repeat
  should emit a waiting event when adding a repeatable job to the waiting list

• Error: Connection is closed. (QueueEvents class never exits  #119.2, docs: fix QueueEvents examples in quick start guide #123.3, Job.fromId String Parameter Contradicts Method Comment/Implementation #134.1, Get Queue Name for Logging #140.2)

Delayed jobs
  should process a delayed job only after delayed time

• timeout (delay should throw if its not a number #196.2, Priority is ignored when using the rate limiter #214.2)

[stansv]

For now it seems all tests are fixed so build became stable enough (tested on my local env, latest CI builds are also succeeded). I'll reopen this in case if new unstable tests will appear.

[stansv]

Delayed jobs
  should process delayed jobs in correct order

• timeout (Reuse connection with lazyConnect on worker #281.1)