Increase mocha default timeout for test stability (#212)
Increase mocha default timeout for test stability (#212)

The Yeoman test framework startup for the first test
in the suite can consume most of our test timeout, therefore
increasing the default timeout should increase test stability.
IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver