Adding support for new attribute in yaml file

[satish-suradkar]

Following three new attribute

1.retries Number of time same api will call if it fails. It has scope at config as well as test level (priority).

2.delay Number of seconds wait to make another api call

3.depends_on Define whether current test (suppose test2) is depend on previous test (suppose test1). If test1 fail then test2 will skip it's execution. Test2 execute if and only if test1 will execute successfully.

At the end of execution, will generate 'test_result.json' file. File contain test name, result, expected status and status recieved.

[svanoort-jenkins]

Can one of the admins verify this patch?