of just pinging it, poll its eventstate in the database, and wait
until it's reported ISUP. This way, we don't report that a node is
ready before it really is. Also bumped up the timeout by a couple of
minutes to account for the extra time it takes for the OS to boot.

Right now, if the OS is considered pingable, we assume that it will
report ISUP. In the future, however, when the node state is more
formalized, we will have better ways of determining this.