Bug 828829 - Refactor Health Report policy out of services/healthreport; r=rnewman

--HG--
rename : services/healthreport/HealthReportService.js => services/datareporting/DataReportingService.js
rename : services/healthreport/modules-testing/mocks.jsm => services/datareporting/modules-testing/mocks.jsm
rename : services/healthreport/policy.jsm => services/datareporting/policy.jsm
rename : services/healthreport/tests/xpcshell/test_policy.js => services/datareporting/tests/xpcshell/test_policy.js
extra : rebase_source : cf766bc99ff843f2d31f82b1c4be71313fbc65a8