Multiple smoke tests flapping inside docker

Since moving smoke tests to run inside Docker containers, the BSMAdminIT has been flapping. It seems to be related to Vaadin's poor DOM performance and timing issues exacerbated by the slower run inside Docker.

I've been able to squash most of the timing problems by making the smoke tests more forgiving in how they enter form data and such, but could never quite make it happy.

See http://bamboo.internal.opennms.com:8085/browse/OPENNMS-ONMS716-60 for an example of the failures.