Add parameter to local/remote shell runner to change delimiter in named parameters

While assisting some users today, I ran into a problem with optparse. In a nutshell, parsing options is hard in Bash, so there are many tendencies to shortcut. One such example:

while [ -n "$1" ]; do
    case $1 in
        -C|--gecos)    gecos=$2;  shift 2;;
        -e|--email)    email=$2;  shift 2;;
        -u|--userid)   userid=$2; shift 2;;
        -d|--dry-run)  dryrun=1;  shift;;
        -h|--help)     usage;;
        *) shift;;
    esac
done

Today, I can change the kwargs_op to any prefix I so desire. But, in all cases, the input is distilled to a dict, and then rendered as key-value pairs. (e.g.: --email=james@fryman.io). This causes a failure with the above logic.

This is not an uncommon pattern, and it would be good to be able to s/=/ / in the above parameter.

The issue names kwargs_op and the local/remote shell runner; start by locating where named parameters are converted from a dict into rendered key-value arguments. Check how the current equals delimiter is applied and make the delimiter configurable, including space-separated arguments for Bash case patterns. Confirm that existing equals-separated behavior still works.