Remove flaky Alerts test.

[sangleganesh]

Is this a BUG REPORT or FEATURE REQUEST?:
BUG
What happened:
Flaky test causes build to fail.
https://travis-ci.org/libopenstorage/openstorage/builds/622799641?utm_source=github_status

What you expected to happen:
Build should pass.

How to reproduce it (as minimally and precisely as possible):
almost every PR fails with travis.

Anything else we need to know?:

Environment:

• Container Orchestrator and version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: