main: wait for API http server to start
main: wait for API http server to start

Wait for the future returned by the http server start process to resolve,
so we know it is started.  If it doesn't, we'll hit the or_terminate()
further down the line and exit with an error code.
Message-Id: <778fb68dfc1b81f2880bcaa595151e748735b492@scylladb.com>

raphaelsc/scylla,kjniemi/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,kjniemi/scylla,raphaelsc/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,raphaelsc/scylla,scylladb/scylla,kjniemi/scylla