modularization of inventory_import command

This separates file parsing logic that was mixed
in with other important code inside of the
inventory import command.

The logic around MemObject data structures was
moved to utils, and the file parsing was moved
to a legacy module. As of this commit, that
module can operate within the Tower environment
but it will be removed.

Also refactor the loggers to fix old bug and
work inside of the different contexts - the
Loader classes, mem objects, and hopefully
the inventory modules eventually.

awx/main/models/inventory.py

@@ -733,6 +733,13 @@ class InventorySourceOptions(BaseModel):
         ('custom', _('Custom Script')),
     ]
 
+    # From the options of the Django management base command
+    INVENTORY_UPDATE_VERBOSITY_CHOICES = [
+        (0, '0 (WARNING)'),
+        (1, '1 (INFO)'),
+        (2, '2 (DEBUG)'),
+    ]
+
     # Use tools/scripts/get_ec2_filter_names.py to build this list.
     INSTANCE_FILTER_NAMES = [
         "architecture",
@@ -879,6 +886,11 @@ class InventorySourceOptions(BaseModel):
         blank=True,
         default=0,
     )
+    verbosity = models.PositiveIntegerField(
+        choices=INVENTORY_UPDATE_VERBOSITY_CHOICES,
+        blank=True,
+        default=1,
+    )
 
     @classmethod
     def get_ec2_region_choices(cls):
@@ -1116,7 +1128,7 @@ class InventorySource(UnifiedJobTemplate, InventorySourceOptions):
     def _get_unified_job_field_names(cls):
         return ['name', 'description', 'source', 'source_path', 'source_script', 'source_vars', 'schedule',
                 'credential', 'source_regions', 'instance_filters', 'group_by', 'overwrite', 'overwrite_vars',
-                'timeout', 'launch_type', 'scm_project_update',]
+                'timeout', 'verbosity', 'launch_type', 'scm_project_update',]
 
     def save(self, *args, **kwargs):
         # If update_fields has been specified, add our field names to it,