Put the coverage data files in the reports dir, where they will be treated...

Put the coverage data files in the reports dir, where they will be treated like the disposable things they are.

cms/.coveragerc

 # .coveragerc for cms
 [run]
-data_file = cms/.coverage
+data_file = reports/cms/.coverage
 
 [report]
 ignore_errors = True

common/lib/capa/.coveragerc

 # .coveragerc for common/lib/capa
 [run]
-data_file = common/lib/capa/.coverage
+data_file = reports/common/lib/capa/.coverage
 
 [report]
 ignore_errors = True

common/lib/xmodule/.coveragerc

 # .coveragerc for common/lib/xmodule
 [run]
-data_file = common/lib/xmodule/.coverage
+data_file = reports/common/lib/xmodule/.coverage
 
 [report]
 ignore_errors = True

lms/.coveragerc

 # .coveragerc for lms
 [run]
-data_file = lms/.coverage
+data_file = reports/lms/.coverage
 
 [report]
 ignore_errors = True

rakefile

@@ -209,10 +209,10 @@ namespace :coverage do
             sh("coverage xml -o reports/#{dir}/coverage.xml --rcfile=#{dir}/.coveragerc")
         end
     end
-end
 
-TEST_TASK_DIRS.each do |dir|
-    CLOBBER.include("#{dir}/.coverage")
+    TEST_TASK_DIRS.each do |dir|
+        CLOBBER.include("#{dir}/.coverage")
+    end
 end
 
 task :runserver => :lms