sleep for 0.1s instead of 1s in the wait_for_status loop

[rade]

This reduces weave launch|launch-dns execution time.

Closes #992.

On my machine, time weave launch takes ~1.95s before this change, and ~1.15s after.

[dpw]

I'm bothered by the redundant sleep to check for the support for fractional sleeps. How about:

fractional_sleep() {
    case $1 in
        *.*)
            if [ -z "$NO_FRACTIONAL_SLEEP" ] ; then
                sleep $1 >/dev/null 2>&1 && return 0
                NO_FRACTIONAL_SLEEP=1
            fi
            sleep $((${1%.*} + 1))
            ;;
        *)
            sleep $1
            ;;
    esac
}

[rade]

I'm bothered by the redundant sleep

Thanks for that code. Incorporated.