MOBILE-2556 course: Decrease WS calls to get_courses_by_field
MOBILE-2556 course: Decrease WS calls to get_courses_by_field

jleyva/moodlemobile2,saman222/moodlemobile2,saman222/moodlemobile2,FMCorz/moodlemobile2,saman222/moodlemobile2,reskit/moodlemobile,FMCorz/moodlemobile2,dpalou/moodlemobile2,reskit/moodlemobile,reskit/moodlemobile,reskit/moodlemobile,moodlehq/moodlemobile2,reskit/moodlemobile,saman222/moodlemobile2,jleyva/moodlemobile2,jleyva/moodlemobile2,dpalou/moodlemobile2,dpalou/moodlemobile2,moodlehq/moodlemobile2,moodlehq/moodlemobile2,reskit/moodlemobile,moodlehq/moodlemobile2,moodlehq/moodlemobile2,jleyva/moodlemobile2,moodlehq/moodlemobile2,saman222/moodlemobile2