allow rsyslog to be none
updating handlers list to conditionally include syslogger-remote
Correct UnboundLocalError exception in student_migration_35
BLD 1020: Easy access to Group Configurations page from Content Experiment component.
Merge pull request #4673 from edx/jarv/rsyslog-handler

Jarv/rsyslog handler
Merge pull request #4613 from edx/jmclaus/easy-access-group-configurations-page

BLD 1020: Easy access to Group Configurations page from Content Experiment component.
Merge pull request #4698 from mitocw/cg/fix_student_migration_35

Correct UnboundLocalError exception in student_migration_35
Make primary button focus state more pronounced
increase contrast of submission_feedback text