Test expression fixed.

Using test statement [...] was wrong for this type of check.

Change-Id: Ie6640189206084c89f665478d93ef2444afcfd5b
Fixes: MRN-903

devbox-scripts/murano-git-install.sh

@@ -47,7 +47,7 @@ function iniset {
         sed -i -e "s/^\($option[ \t]*=[ \t]*\).*$/\1$value/" "$file"
     else
         # Check if section already exists
-        if [ ! $(grep -q "^\[$section\]" "$file") ]; then
+        if ! grep -q "^\[$section\]" "$file" ; then
             # Add section at the end
             echo -e "\n[$section]" >>"$file"
         fi