Update to determine sis enrollment sections

Changes for sections:

(1) SIS section id that matches the current course instance id, will appear first on the list

(2) Those sections with a sis section id which is also a course instance id will appear above those sections that either do not have a sis section id or does not have a course instance id
This handles the check for matching course instance id(say 123456). It's possible that this may also have the 'ci' namespace and could be in the format 'ci:123456'. Need to check that as well for placing it first on list? Similar to the check on line 378 for cross listed course.