Mount binding not working correctly if format is in form of key=value

[tomuben]

Background

In #10 we implemented "mount binding" to the docker container for directories which were given in the parameters.
This mechanism is working if the parameter is given in the form of:

exaslct cmd key1 value1 key2 value2

but not when given in the form:

exaslct cmd key1=value1 key2=value2

The second form is documented in the officiel README.md.

Acceptance Criteria

Change implementation for parameter parsing in exaslct_within_docker_container.sh so, that it collects directories given as parameter list in the form:

exaslct cmd key1=value1 key2=value2