Remove reference to reason field, add action field

As work progressed on entitlement support tool,
additional clarity around the entitlement support
detail fields was needed, this adds the action field
at a later point the reason field will be removed

Learner-3925

common/djangoapps/entitlements/admin.py

@@ -58,7 +58,6 @@ class CourseEntitlementSupportDetailAdmin(admin.ModelAdmin):
     """
     list_display = ('entitlement',
                     'support_user',
-                    'reason',
                     'comments',
                     'unenrolled_run')
     raw_id_fields = ('unenrolled_run', 'support_user',)

common/djangoapps/entitlements/migrations/0006_courseentitlementsupportdetail_action.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('entitlements', '0005_courseentitlementsupportdetail'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='courseentitlementsupportdetail',
+            name='action',
+            field=models.CharField(default='CREATE', max_length=15, choices=[(b'REISSUE', b'Re-issue entitlement'), (b'CREATE', b'Create new entitlement')]),
+            preserve_default=False,
+        ),
+    ]

common/djangoapps/entitlements/models.py

@@ -420,6 +420,7 @@ class CourseEntitlementSupportDetail(TimeStampedModel):
     """
     Table recording support interactions with an entitlement
     """
+    # Reasons deprecated
     LEAVE_SESSION = 'LEAVE'
     CHANGE_SESSION = 'CHANGE'
     LEARNER_REQUEST_NEW = 'LEARNER_NEW'
@@ -432,10 +433,21 @@ class CourseEntitlementSupportDetail(TimeStampedModel):
         (COURSE_TEAM_REQUEST_NEW, u'Course team requested entitlement for learnerg'),
         (OTHER, u'Other'),
     )
+
+    REISSUE = 'REISSUE'
+    CREATE = 'CREATE'
+    ENTITLEMENT_SUPPORT_ACTIONS = (
+        (REISSUE, 'Re-issue entitlement'),
+        (CREATE, 'Create new entitlement'),
+    )
+
     entitlement = models.ForeignKey('entitlements.CourseEntitlement')
     support_user = models.ForeignKey(settings.AUTH_USER_MODEL)
 
+    #Deprecated: use action instead.
     reason = models.CharField(max_length=15, choices=ENTITLEMENT_SUPPORT_REASONS)
+    action = models.CharField(max_length=15, choices=ENTITLEMENT_SUPPORT_ACTIONS)
+
     comments = models.TextField(null=True)
 
     unenrolled_run = models.ForeignKey(