Remove limit on limit field.

This allows 'relaunch-on-failed' on an arbitrary number of failed hosts.

awx/main/migrations/0058_v350_remove_limit_limit.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.16 on 2019-02-05 18:29
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0057_v350_remove_become_method_type'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='job',
+            name='limit',
+            field=models.TextField(blank=True, default=''),
+        ),
+        migrations.AlterField(
+            model_name='jobtemplate',
+            name='limit',
+            field=models.TextField(blank=True, default=''),
+        ),
+    ]

awx/main/models/jobs.py

@@ -93,8 +93,7 @@ class JobOptions(BaseModel):
         blank=True,
         default=0,
     )
-    limit = models.CharField(
-        max_length=1024,
+    limit = models.TextField(
         blank=True,
         default='',
     )