trove-integration changes $HOME and there are problems if any devstack plugin wants $HOME

[Amrith Kumar]

In redstack, there's a function set_home_dir()

function set_home_dir() {
    self="${0#./}"
    base="${self%/*}"
    current=`pwd`
    if [ "$base" = "$self" ] ; then
        HOME="$current/"
    elif [[ $base =~ ^/ ]]; then
        HOME="$base/"
    else
        HOME="$current/$base/"
    fi
}

Now, if some devstack plugin wants to look at $HOME, much hilarity ensues

I have no idea why we set $HOME but it seems like a bad thing to be doing ...