Adds messagebroker-config to make file
DS-434 Variable for School API endpoint
DS-439 #done Updates Services contrib module
DS-440 #done Only return  if signup form instance
Merge pull request #3107 from DeeZone/Issue3102-Add_messagebroker_config

Adds messagebroker-config to make file
Merge pull request #3118 from aaronschachter/DS-440

Fixes Signup Form PHP Notice
Merge pull request #3117 from aaronschachter/services_update

Updates Services contrib module
Merge pull request #3116 from aaronschachter/DS-434

Variable for School API endpoint