iCmd5250 doesn't work properly for CL commands with parameters

[kadler]

@kadler after installing SI70667 PTF we are getting following error

sh: syntax error at line 1 : `(' unexpected
<?xml version="1.0" ?><xmlservice><sh error="on" var="aspgroup_cmd">
</sh>
</xmlservice>

Originally posted by @ranga543 in #48 (comment)