Add institute name used on ESGF for CanAM4, CanCM4, and CanESM2

Author: bouweandela

esmvalcore/config/extra_facets/cmip5-institutes.yml

@@ -22,15 +22,21 @@
 'CanAM4':
   '*':
     '*':
-      institute: ['CCCma']
+      institute:
+        - 'CCCma'  # name used in dataset_id/directory tree
+        - 'CCCMA'  # name used on ESGF
 'CanCM4':
   '*':
     '*':
-      institute: ['CCCma']
+      institute:
+        - 'CCCma'  # name used in dataset_id/directory tree
+        - 'CCCMA'  # name used on ESGF
 'CanESM2':
   '*':
     '*':
-      institute: ['CCCma']
+      institute:
+        - 'CCCma'  # name used in dataset_id/directory tree
+        - 'CCCMA'  # name used on ESGF
 'CCSM4':
   '*':
     '*':