Improves host details panel UI

* Hooks up the first two context menu buttons
* Makes the rename and details menu show up
    wherever the user's cursor's location
* Adds TopologyInventory and DeviceHost tables
* Adds design for host_id on the Device table
* Adds migrations for TopologyInventory
* Adds host_id to Device table
* Adds inventory_id and host_id tracking
* Auto-closes the right hand panel if focus is directed to the canvas.
* Retrieves the host details on inventory load.
* Adds back support for inventory and host_id tracking
* Adds host icon
* Changes rack icon to new icon
* Site icon replacement
* Fixes host icon "hitbox", and adding debug and construction
* Adds construction and debug lines for switch, router, rack, and site
* Adds some error handling for REST calls, as well as alert on
    host detail panel.

awx/network_ui/migrations/0025_devicehost_topologyinventory.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('network_ui', '0024_auto_20171213_1949'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DeviceHost',
+            fields=[
+                ('device_host_id', models.AutoField(serialize=False, primary_key=True)),
+                ('host_id', models.IntegerField()),
+                ('device', models.ForeignKey(to='network_ui.Device')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='TopologyInventory',
+            fields=[
+                ('topology_inventory_id', models.AutoField(serialize=False, primary_key=True)),
+                ('inventory_id', models.IntegerField()),
+                ('topology', models.ForeignKey(to='network_ui.Topology')),
+            ],
+        ),
+    ]

awx/network_ui/migrations/0026_auto_20180105_1403.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('network_ui', '0025_devicehost_topologyinventory'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='devicehost',
+            name='device',
+        ),
+        migrations.AddField(
+            model_name='device',
+            name='host_id',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.DeleteModel(
+            name='DeviceHost',
+        ),
+    ]