Distro tests fail randomly

The webdriver tests in https://ci.openmrs.org/browse/REFAPP-OMODDISTRO fail, seemingly randomly.

Possibly this is due to the CI server running slowly, and the tests not waiting long enough for success. As a first pass I suggest changing the implicit wait defined here to be 5 seconds instead of 2:

https://github.com/openmrs/openmrs-contrib-uitestframework/blob/master/src/main/java/org/openmrs/uitestframework/test/TestBase.java#L101