[sr-dev] [kamailio/kamailio] kamctl - shell interpreter selection (#2019)

[sergey-safarov]

May be this
```sh
#!/bin/sh

get_answer ()
{
    value=$1
    question=$2
    if [ "${value}" = "ask" ]; then
        echo -n "$question"
        read value
    fi
    ANSWER=$(echo ${value} | grep -o -e '[YyNn]' | sed -e 's/Y/y/' -e 's/N/n/')
}

get_answer ask "My question?"
```

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