Add job lifecycle logging

Various	points (e.g. created, running, processing events), are
structured into	json format and	output to /var/log/tower/job_lifecycle.log

As part	of this	work, the DependencyGraph is reworked to return
which job object is doing the blocking, rather than a boolean.

awx/main/utils/formatters.py

@@ -3,6 +3,7 @@
 
 from copy import copy
 import json
+import json_log_formatter
 import logging
 import traceback
 import socket
@@ -14,6 +15,15 @@ from django.core.serializers.json import DjangoJSONEncoder
 from django.conf import settings
 
 
+class JobLifeCycleFormatter(json_log_formatter.JSONFormatter):
+    def json_record(self, message: str, extra: dict, record: logging.LogRecord):
+        if 'time' not in extra:
+            extra['time'] = now()
+        if record.exc_info:
+            extra['exc_info'] = self.formatException(record.exc_info)
+        return extra
+
+
 class TimeFormatter(logging.Formatter):
     '''
     Custom log formatter used for inventory imports

awx/main/utils/handlers.py

@@ -103,6 +103,15 @@ if settings.COLOR_LOGS is True:
         from logutils.colorize import ColorizingStreamHandler
 
         class ColorHandler(ColorizingStreamHandler):
+            def colorize(self, line, record):
+                # comment out this method if you don't like the job_lifecycle
+                # logs rendered with cyan text
+                previous_level_map = self.level_map.copy()
+                if record.name == "awx.analytics.job_lifecycle":
+                    self.level_map[logging.DEBUG] = (None, 'cyan', True)
+                msg = super(ColorHandler, self).colorize(line, record)
+                self.level_map = previous_level_map
+                return msg
 
             def format(self, record):
                 message = logging.StreamHandler.format(self, record)