Try to make TestBind a bit less flaky
Try to make TestBind a bit less flaky

This tries to query the server to figure out whether the user.toml
file was updated in 10 second intervals for 2 minutes instead of
waiting for 1 minute and bail out if it wasn't updated yet. Updating
user.toml through k8s Secret may take some time.

At the same time, rename a defaultWaitTime constant into something
that describes better its use in the only place.

kinvolk/habitat-operator,kinvolk/habitat-operator