Adding a new verification job for testapi UI.

Adding a new verification job for testapi UI.

TestAPI web portal is being developed as part of an intern
project. Angular JS framework is being used to develop UI
functionalities. Also, corresponding unit tests have been
written. Grunt JS is javascript task runner which is used
to run tasks such as unit tests, coverage report etc. grunt e2e is
the name of the task to run unit tests. Tasks are defiend in
Gruntfile.js.

To run the unit tests, google chrome is required. Here, the unit tests are
ran using headless google chrome. Finally cobertura coverage report is
generated.

JIRA: RELENG-382

Change-Id: Ib12f8dd851276ab0e4116beb122518e9431d5b61
Signed-off-by: Sakala Venkata Krishna Rohit <rohitsakala@gmail.com>